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- 1. phys. stat. sol. (b) 245, 1298-1314 (2008) , “EPR identification of intrinsic defects in SiC”, J. Isoya, T. Umeda, N. Mizuochi, N. T. Son, E. Janzen, T. OhshimaThe structure determination of intrinsic defects in 4H-SiC, 6H-SiC, and 3C-SiC by means of EPR is based on measuring the angular dependence of the 29Si/13C hyperfine (HF) satellite lines, from which spin densities, sp-hybrid ratio, and p-orbital direction can be determined over... (Read more)Si SiC diamond| EPR Theory electron-irradiation thermal-meas./anneal-exp.| +1 -1 0(neutral) 1.0eV~ 13C 29Si C1h C3v Carbon Csi D2d EI5/6 HEI1 HEI9/10 P6/7 Silicon T1 Td Tv2a V1/2/3 Vc Vsi antisite dangling-bond mono(=1) motional-effect n-type p-type pair(=2) quartet semi-insulating spin-relaxation triplet vacancy .inp files: SiC/Baranov/Baranov_g.inp SiC/EI5_C1h/5.inp SiC/EI5_C3v/5.inp SiC/EI6_RT/6.inp SiC/HEI10/HEI10a.inp SiC/HEI10/HEI10b.inp SiC/HEI1_C1h/1.inp SiC/HEI9/HEI9a.inp SiC/HEI9/HEI9b.inp SiC/SI5_C1h/4.inp SiC/Ky2/Ky2.inp SiC/Tv2a/Main.INP SiC/Vsi-_II_4H/Main.INP SiC/Vsi-_II_6H/Main.INP SiC/Vsi-_I_4H/Main.INP SiC/Vsi-_I_6H/Main.INP | last update: Takahide Umeda
- 2. Appl. Phys. Lett. 90, 023112 (2007) , “Electrically tunable defects in metallic single-walled carbon nanotubes”, Ji-Yong ParkA defect whose electron transmission probability can be controlled by electric field is intentionally created on a metallic single-walled carbon nanotube (SWCNT) with a voltage pulse from a tip of an atomic force microscope (AFM). Localized characteristics of the created defect are elucidated with... (Read more)
- 3. Appl. Phys. Lett. 90, 013104 (2007) , “Scanning tunneling microscopy investigations of hydrogen plasma-induced electron scattering centers on single-walled carbon nanotubes”, G. Buchs, P. Ruffieux, P. Gröning, and O. GröningThe authors report on the generation of localized defects on single-walled carbon nanotubes by means of a hydrogen electron cyclotron resonance plasma. The defects have been investigated using scanning tunneling microscopy (STM) and show an apparent topographic height in the STM of 1–3 ... (Read more)
- 4. Phys. Rev. B 75, 075202 (2007) , “Theoretical study of Li and Na as n-type dopants for diamond”, J. P. Goss and P. R. BriddonPhosphorus is the n-type dopant of choice for diamond, but results in a deep donor level and alternatives are being sought. One possibility is the incorporation of interstitial alkali metal impurities such as Li and Na. We present the results of density-functional calculations used to predict... (Read more)
- 5. Phys. Rev. B 75, 033301 (2007) , “Microscopic evidence for evolution of superconductivity by effective carrier doping in boron-doped diamond: 11B-NMR study”, H. Mukuda, T. Tsuchida, A. Harada, Y. Kitaoka, T. Takenouchi, Y. Takano, M. Nagao, I. Sakaguchi, T. Oguchi, and H. KawaradaWe have investigated the superconductivity discovered in boron-doped diamonds by means of 11B-NMR on heteroepitaxially grown (111) and (100) films. 11B-NMR spectra for all of the films are identified to arise from the substitutional B(1) site as single occupation and lower... (Read more)
- 6. Phys. Rev. Lett. 98, 216103 (2007) , “Influence of Cumulenic Chains on the Vibrational and Electronic Properties of sp-sp2 Amorphous Carbon”, L. Ravagnan, P. Piseri, M. Bruzzi, S. Miglio, G. Bongiorno, A. Baserga, C. S. Casari, A. Li Bassi, C. Lenardi, Y. Yamaguchi, T. Wakabayashi, C. E. Bottani, and P. MilaniWe report the production and characterization of a form of amorphous carbon with sp-sp2 hybridization (atomic fraction of sp hybridized species 20%) where the predominant sp bonding appears to be (=C=C=)n cumulene.... (Read more)
- 7. Phys. Rev. Lett. 98, 135506 (2007) , “Possible Approach to Overcome the Doping Asymmetry in Wideband Gap Semiconductors”, Yanfa Yan, Jingbo Li, Su-Huai Wei, and M. M. Al-JassimThe asymmetry doping problem has severely hindered the potential applications of many wideband gap (WBG) materials. Here, we propose a possible approach to overcome this long-standing doping asymmetry problem for WBG semiconductors. Our approach is based on the reduction of the ionization energies... (Read more)
- 8. Appl. Phys. Lett. 89, 243101 (2006) , “Random telegraph signals and noise behaviors in carbon nanotube transistors”, Fei Liu, Kang L. Wang, Daihua Zhang, and Chongwu ZhouA random telegraph signal appears at a smaller absolute gate bias for a larger absolute drain-source bias in a carbon nanotube transistor. Its mechanism is attributed to a defect located in the drain side of the Schottky barrier carbon nanotube transistor with Ti/Au as contact material. Furthermore,... (Read more)
- 9. Appl. Phys. Lett. 89, 232111 (2006) , “Electron-beam-induced dissociation of B–D complexes in diamond”, J. Barjon, J. Chevallier, F. Jomard, C. Baron, and A. DeneuvilleThe diffusion of deuterium in boron-doped homoepitaxial diamond films leads to the passivation of boron acceptors via the formation of B–D complexes. In this letter, the stability of B–D pairs is investigated under the stress of a low-energy (10 keV) electron-beam irradiation at low... (Read more)
- 10. Appl. Phys. Lett. 89, 173108 (2006) , “Midgap luminescence centers in single-wall carbon nanotubes created by ultraviolet illumination”, Konstantin Iakoubovskii, Nobutsugu Minami, Yeji Kim, Kanae Miyashita, Said Kazaoui, and Balakrishnan NaliniThe authors report the effect of ultraviolet (UV) illumination on optical properties of single-wall carbon nanotubes (SWCNTs) isolated using various dispersants. It is demonstrated that even weak UV light (~1 mW/cm2) can irreversibly alter the SWCNT structure, thus resulting in the... (Read more)
- 11. Appl. Phys. Lett. 89, 131918 (2006) , “Hydrogen incorporation processes in nanodiamond films studied by isotopic induced modifications of Raman spectra”, Sh. Michaelson, O. Ternyak, A. Hoffman, and Y. LifshitzThe effect of replacing H by D and C-12 by C-13 in the gas species used to grow different types of nanodiamond films on the Raman spectra of these films was studied. The modifications of the Raman spectra were investigated in submicron sized diamond films grown by hot filament chemical vapor... (Read more)
- 12. Appl. Phys. Lett. 89, 122111 (2006) , “Hall electron mobility in diamond”, J. Pernot, C. Tavares, E. Gheeraert, E. Bustarret, M. Katagiri, and S. KoizumiThe low field Hall mobility of electron in diamond was investigated from room temperature to 873 K, both experimentally and theoretically. The acoustic deformation potential for electron scattering is determined by fitting of theoretical calculations to experimental data for high quality {111}... (Read more)
- 13. Appl. Phys. Lett. 88, 091912 (2006) , “Hydrogen-vacancy related defect in chemical vapor deposition homoepitaxial diamond films studied by electron paramagnetic resonance and cathodoluminescence”, N. Mizuochi, H. Watanabe, H. Okushi, S. Yamasaki, J. Niitsuma, T. SekiguchiHydrogen-vacancy related defect (H1) in chemical vapor deposition homoepitaxial diamond films has been investigated by electron paramagnetic resonance and cathodoluminescence. It is found that the concentration of H1 significantly decreases as the dilution... (Read more)
- 14. J. Appl. Phys. 100, 124315 (2006) , “Magnetic resonance study of Ni nanoparticles in single-walled carbon nanotube bundles”, A. A. Konchits, F. V. Motsnyi, Yu. N. Petrov, S. P. Kolesnik, V. S. Yefanov, M. L. Terranova, E. Tamburri, S. Orlanducci, V. Sessa, and M. RossiWe present a detailed study of the electron magnetic resonance (EMR) properties of Ni nanoparticles (NPs) placed in the bundles of single-walled carbon nanotubes produced by arc discharge with Ni catalyst. The behavior of EMR signals has been investigated in the 10–300 K temperature range for... (Read more)
- 15. J. Appl. Phys. 99, 104906 (2006) , “An x-ray topographic study of diamond anvils: Correlation between defects and helium diffusion”, Agnès Dewaele, Paul Loubeyre, and Ramesh AndréX-ray topographic images of several dozens of diamonds have been recorded before and after their use as anvils in a diamond anvil high pressure cell. The aim of this study is to better understand and prevent the breakage of diamond anvils when they are used in contact with a helium sample. Indeed,... (Read more)
- 16. Phys. Rev. B 74, 245217 (2006) , “Donor levels for selected n-type dopants in diamond: A computational study of the effect of supercell size”, J. P. Goss, P. R. Briddon, and R. J. EyreComputational techniques are key predictive tools in the drive to engineer semiconductive materials. Diamond, intrinsically a wide band-gap insulator, can be made to semiconduct n-type by doping with phosphorus. However, the relatively deep level at Ec−0.6 eV... (Read more)
- 17. Phys. Rev. B 74, 245216 (2006) , “Influence of excited states of a deep substitutional dopant on majority-carrier concentration in semiconductors”, Hideharu MatsuuraThe density (NA) and energy level (EA) of an acceptor in a p-type wide-band-gap semiconductor (e.g., SiC, GaN, and diamond) are determined by a least-squares fit of the charge neutrality equation to the temperature dependence of the hole... (Read more)
- 18. Phys. Rev. B 74, 235434 (2006) , “Transport properties of n-type ultrananocrystalline diamond films”, I. S. Beloborodov, P. Zapol, D. M. Gruen, and L. A. CurtissWe investigate transport properties of ultrananocrystalline diamond films for a broad range of temperatures. Addition of nitrogen during plasma-assisted growth increases the conductivity of ultrananocrystalline diamond films by several orders of magnitude. We show that films produced at low... (Read more)
- 19. Phys. Rev. B 74, 161203(R) (2006) , “Room-temperature manipulation and decoherence of a single spin in diamond”, R. Hanson, O. Gywat, and D. D. AwschalomWe report on room-temperature coherent manipulation of the spin of a single nitrogen-vacancy center in diamond and a study of its coherence as a function of magnetic field. We use magnetic resonance to induce Rabi nutations and apply a Hahn spin echo to remove the effect of low-frequency dephasing.... (Read more)
- 20. Phys. Rev. B 74, 140502(R) (2006) , “Lattice parameters and thermal expansion of superconducting boron-doped diamonds”, V. V. Brazhkin, E. A. Ekimov, A. G. Lyapin, S. V. Popova, A. V. Rakhmanina, S. M. Stishov, V. M. Lebedev, Y. Katayama, and K. KatoUsing two different high-pressure techniques, we have prepared boron-doped diamonds with atomic concentration of the dopant ranging from 0.04% to 4% (from 7×1019 to 7×1021 atom/cm3) and studied the lattice constants and thermal expansion of the diamonds... (Read more)
- 21. Phys. Rev. B 74, 104303 (2006) , “Nitrogen-vacancy center in diamond: Model of the electronic structure and associated dynamics”, N. B. Manson, J. P. Harrison, and M. J. SellarsSymmetry considerations are used in presenting a model of the electronic structure and the associated dynamics of the nitrogen-vacancy center in diamond. The model accounts for the occurrence of optically induced spin polarization, for the change of emission level with spin polarization and for new... (Read more)
- 22. Phys. Rev. B 73, 245211 (2006) , “Hydrogen and muonium in diamond: A path-integral molecular dynamics simulation”, Carlos P. Herrero, Rafael Ramírez, and Eduardo R. HernándezIsolated hydrogen, deuterium, and muonium in diamond have been studied by path-integral molecular dynamics simulations in the canonical ensemble. Finite-temperature properties of these point defects were analyzed in the range from 100 to 800 K. Interatomic interactions were modeled by a... (Read more)
- 23. Phys. Rev. B 73, 245207 (2006) , “Photoionization measurement of deep defects in single-crystalline CVD diamond using the transient-current technique”, J. Isberg, A. Tajani, and D. J. TwitchenWe have adopted the transient-current technique as a sensitive method to detect small concentrations of charged defects in diamond and to study its photoionization spectrum. It is found that ionized impurity concentrations in the interval 1091013 cm3 can... (Read more)
- 24. Phys. Rev. B 73, 115204 (2006) , “Platelets and the 110a0/4 {001} stacking fault in diamond”, J. P. Goss, P. R. Briddon, R. Jones, M. I. HeggieElectron microscopy reveals the presence of {001} platelets in annealed, nitrogen containing diamond. These extended planar defects give rise to a large displacement of the surrounding material, are correlated with luminescence and optical absorption, and are characterized by the B... (Read more)
- 25. Phys. Rev. Lett. 97, 137206 (2006) , “Electron Spin Resonance of Proton-Irradiated Graphite”, Kyu Won Lee and Cheol Eui LeeIn the case of colossal magnetoresistance in the perovskite manganites, "double exchange" mediated by the itinerant spins is believed to play a key role in the ferromagnetism. In contrast, the conventional "Heisenberg" interaction, i.e., direct (unmediated) interaction between... (Read more)
- 26. Phys. Rev. Lett. 97, 087601 (2006) , “Polarization and Readout of Coupled Single Spins in Diamond”, R. Hanson, F. M. Mendoza, R. J. Epstein, and D. D. AwschalomWe study the coupling of a single nitrogen-vacancy center in diamond to a nearby single nitrogen defect at room temperature. The magnetic dipolar coupling leads to a splitting in the electron spin resonance frequency of the nitrogen-vacancy center, allowing readout of the state of a single nitrogen... (Read more)
- 27. Physica B 376-377, 358-361 (2006) , “Pulsed EPR studies of Phosphorus shallow donors in diamond and SiC”, J. Isoya, M. Katagiri, T. Umeda, S. Koizumi, H. Kanda, N. T. Son, A. Henry, A. Gali, E. JanzénPhosphorus shallow donors having the symmetry lower than Td are studied by pulsed EPR. In diamond:P and 3C–SiC:P, the symmetry is lowered to D2d and the density of the donor wave function on the phosphorus atom exhibits a predominant p-character. In 4H–SiC:P with the site symmetry of... (Read more)
- 28. Appl. Phys. Lett. 87, 222101 (2005) , “Trapping-detrapping defects in single crystal diamond films grown by chemical vapor deposition”, A. Balducci, Marco Marinelli, E. Milani, M. E. Morgada, G. Prestopino, M. Scoccia, A. Tucciarone, and G. Verona-RinatiHigh-quality single-crystal diamond films were homoepitaxially grown by chemical vapor deposition onto low cost high-pressure high-temperature diamond substrates. The transport properties of the obtained samples were studied by photoresponse characterization. Fast ultraviolet (5 ns) laser pulses at... (Read more)
- 29. Phys. Rev. Lett. 92, 135502 (2004) , “Hydrogen Incorporation in Diamond: The Vacancy-Hydrogen Complex”, C. Glover, M. E. Newton, P. M. Martineau, S. Quinn, D. J. TwitchenWe report the identification of the vacancy-hydrogen complex in single crystal diamond synthesized by chemical vapor deposition. The S = 1 defect is observed by electron paramagnetic resonance in the negative charge state. The hydrogen atom is bonded to one of the carbon atoms neighboring the... (Read more)
- 30. Phys. Rev. Lett. 90, 185507 (2003) , “Hydrogen Incorporation in Diamond: The Nitrogen-Vacancy-Hydrogen Complex”, C. Glover, M. E. Newton, P. Martineau, D. J. Twitchen, J. M. BakerWe report the identification of the nitrogen-vacancy-hydrogen complex in a freestanding nitrogen-doped isotopically engineered single crystal diamond synthesized by chemical vapor deposition. The hydrogen atom is located in the vacancy of a nearest-neighbor nitrogen-vacancy defect and appears to be... (Read more)
- 31. Phys. Rev. B 66, 161202(R) (2002) , “Phosphorus and sulphur doping of diamond”, L. G. Wang and Alex ZungerPrevious calculations on n-type doping of diamond by P and S predicted that S has a shallower level and a higher solubility than P. Our first-principles calculations show that the opposite is true: Phosphorus impurity in diamond gives rise to a shallower donor level, and has a higher bulk solid... (Read more)
- 32. Diamond Relat. Mater. 10, 580-584 (2001) , “Phosphorus site after CIRA implantation of type IIa diamond”, N. Casanova, E. Gheeraert, A. Deneuville, C. Uzan-Saguy and R. KalishA set of type IIa diamond crystals was processed by cold implantation and rapid annealing at 1050°C ex situ annealing at 1400°C and investigated by ESR measurement. The ESR spectra of CIRA and post-annealed samples show an isotropic line at g=2.003, a set of anisotropic hyperfine lines,... (Read more)
- 33. Diamond Relat. Mater. 10, 480-484 (2001) , “EPR study of preferential orientation of crystallites in N-doped high quality CVD diamond”, S. Nokhrin, J. Rosa, M. Vanecek, A. G. Badalyan and M. NesladekThe directions of preferential growth of free-standing optical-quality CVD diamond wafers have been investigated with the help of electron paramagnetic resonance (EPR). EPR signals of the well-known P1 centre (substitutional nitrogen) have been used as a probe. A computer simulation of EPR spectra... (Read more)
- 34. Diamond Relat. Mater. 10, 434-438 (2001) , “Interstitial aggregates in diamond”, J. P. Goss, B. J. Coomer, R. Jones, T. D. Shaw, P. R. Briddon and S. ÖbergTheoretical modelling of magnetic resonance signals lead to convincing models for the first three self-interstitial aggregates in diamond. These in turn suggest the manner in which larger more stable aggregates including the platelet, observed in annealed type I diamonds, are formed. (Read more)
- 35. Diamond Relat. Mater. 10, 1681-1683 (2001) , “EPR and optical imaging of the growth-sector dependence of radiation-damage defect production in synthetic diamond”, G. A. Watt, M. E. Newton and J. M. BakerEPR imaging data are presented for the distribution of single substitutional nitrogen (P1) in a synthetic diamond of mixed IIa/Ib character, and compared with the distribution of the di-001-split interstitial (R1) produced during an electron irradiation. Since the defects are localised in different... (Read more)
- 36. J. Phys.: Condens. Matter 13, 8957-8964 (2001) , “Determination of the W8 and AB5 defect levels in the diamond gap”, R. N. Pereira, W. Gehlhoff, N. A. Sobolev, A. J. Neves, D. BimbergElectron paramagnetic resonance (EPR) and photo-EPR investigations on synthetic diamond crystals have allowed an unambiguous determination of nickel-related defect levels in the diamond bandgap. Indirect photoinduced recharging of the nitrogen donor and detection of two... (Read more)
- 37. J. Phys.: Condens. Matter 13, 2053-2060 (2001) , “Possible evidence of a copper-related electron paramagnetic resonance centre in diamond”, J. M. BakerThe EPR centre W36, found in natural type IIb diamond, has been previously attributed to a boron-related point defect, largely on account of its four line hyperfine structure attributed to 11B. The attribution has been re-examined, and no simple boron-related site has been found... (Read more)
- 38. J. Phys.: Condens. Matter 13, 2045-2051 (2001) , “An annealing study of the R1 EPR centre (the neatest-neighbour di-<100>-split self-interstitial) in diamond”, D. J. Twitchen, M. E. Newton, J. M. Baker, T. R. Anthony, W. F. BanholzerResults are reported of both isochronal and isothermal annealing studies of the R1 EPR centre (known to be a pair of parallel nearest-neighbouring 100-split self-interstitials) produced by 2 MeV electron irradiation of synthetic type IIa diamonds of very low defect concentration before... (Read more)
- 39. Phys. Rev. B 64, 041201 (2001) , “Combined optical and microwave approach for performing quantum spin operations on the nitrogen-vacancy center in diamond”, Forrest T. Charnock and T. A. KennedyElectron spin echoes were performed on nitrogen-vacancy (N-V) centers in diamond using optical polarization and detection and 35 GHz microwave control. The experiments demonstrate an approach to quantum information in the solid state. A phase memory time of 3.6??s was measured, and coupling of the... (Read more)
- 40. Phys. Rev. B 63, 195208 (2001) , “Self-interstitial aggregation in diamond”, J. P. Goss, B. J. Coomer, R. Jones, T. D. Shaw, P. R. Briddon, M. Rayson, S. ÖbergFirst-principles methods are used to investigate the self-interstitial and its aggregates in diamond. The experimental assignment of the spin-1 R2 EPR center to the single interstitial has been questioned because of the small fine-structure term observed. We calculate the spin-spin interaction... (Read more)
- 41. phys. stat. sol. (a) 186, 215-220 (2001) , “First Principles Study of the Self-Interstitial Defect in Diamond”, J. P. Goss, R. Jones, T. D. Shaw, M. J. Rayson, P. R. BriddonFirst principles techniques have been employed to examine the isolated self-interstitial in diamond. The assignment of the R2 EPR center to the self-interstitial has been questioned because of the small fine structure term. We have calculated the spin-spin interaction tensor, which resolves the... (Read more)
- 42. phys. stat. sol. (a) 186, 199-206 (2001) , “Characterization of Defects in as-Grown CVD Diamond Films and HPHT Diamond Powders by Electron Paramagnetic Resonance”, K. Iakoubovskii, A. StesmansSeveral defect centers, labeled as KUL1-7, have been detected by electron paramagnetic resonance in CVD diamond films and synthetic diamond powders. Their g values were determined relatively to the P1 (NS0) center, for which the value of g = 2.00216(1) with... (Read more)
- 43. phys. stat. sol. (a) 186, 167-176 (2001) , “What We Have Learned about Intrinsic Defects in Silicon: A Help in Understanding Diamond?”, G. D. WatkinsWhat we have established by electron paramagnetic resonance (EPR) studies in silicon concerning the properties of its intrinsic defects (vacancies and interstitials) and their interactions with other defects is reviewed. The lessons learned are compared to what is currently being observed in... (Read more)
- 44. Physica B 308-310, 593 (2001) , “Electrically detected magnetic resonance studies of phosphorus doped diamond ”, T. Graf, M. S. Brandt, C. E. Nebel, M. Stutzmann and S. KoizumiPhosphorus doped n-type epitaxial diamond films have been studied by electron spin resonance (ESR) and electrically detected magnetic resonance (EDMR). At low electric field, the dominant defects influencing the electronic transport are carbon dangling bonds, while at higher fields the anisotropic... (Read more)
- 45. Physica B 302-303, 88-100 (2001) , “Magnetospectroscopy of acceptors in "blue" diamonds”, Hyunjung Kim, A. K. Ramdas, S. Rodriguez, Zdenka Barticevic, M. Grimsditch and T. R. AnthonyNaturally occurring, nitrogen-free, p-type diamond—now known to be boron-doped—as well as man-made diamonds deliberately doped with boron display an electronic Raman transition, Δ′, originating in the 1s(p3/2) : Γ8 ground state of the acceptor and terminating in its... (Read more)
- 46. Chem. Phys. Lett. 322, 273-279 (2000) , “Room-temperature field dependence of the electron spin–lattice relaxation times of paramagnetic P1 and P2 centers in diamond”, Cornelis J. Terblanche and Eduard C. ReynhardtElectron spin–lattice relaxation (SLR) times of P1 and P2 centers have been measured at 300 K at X-band and W-band for one synthetic (type-Ib) and three natural (type-Ia) diamonds using electron paramagnetic resonance spectroscopy. Bi-exponential SLR, with a fast and a slow component, was... (Read more)
- 47. Diamond Relat. Mater. 9, 883-886 (2000) , “Mechanisms of nitrogen aggregation in nickel- and cobalt-containing synthetic diamonds”, V. A. Nadolinny, A. P. Yelisseyev, J. M. Baker, D. J. Twitchen, M. E. Newton, B. N. Feigelson and O. P. YuryevaWe present a study of the point defects observed in as-grown and annealed synthetic diamonds using electron paramagnetic resonance (EPR) and infrared spectroscopy. The diamonds were grown by the temperature gradient HPHT method in a split sphere apparatus using Fe–Ni–C or... (Read more)
- 48. Diamond Relat. Mater. 9, 424-427 (2000) , “Experimental and theoretical studies of cobalt defects in diamond”, Karl Johnston, Alison Mainwood, Alan T. Collins, Gordon Davies, Daniel Twitchen, Mark Newton and J. M. BakerDiamonds grown with a cobalt/iron solvent catalyst and annealed at 1800°C were cut and polished along the main symmetry directions. The photoluminescence spectrum showed at least four zero phonon lines. One line at 2.367 eV splits and shifts under uniaxial stress indicating that it originates... (Read more)
- 49. Diamond Relat. Mater. 9, 417-423 (2000) , “Spectroscopy of defects and transition metals in diamond”, A. T. CollinsThis article reviews the optical and electron paramagnetic resonance (EPR) studies that have been carried out on diamonds containing nickel-related or cobalt-related defect centres. It is shown that this work is now at a stage where a real understanding may be reached about the nature of the defects... (Read more)
- 50. Diamond Relat. Mater. 9, 337-340 (2000) , “Structural changes in CVD diamond film by boron and nitrogen doping”, Yoshiyuki Show, Toshikazu Matsukawa, Hirokazu Ito, Mitsuo Iwase and Tomio IzumiThe effect of impurity atoms in the defect structures of a diamond film has been studied by electron spin resonance (ESR). It has been observed that introducing boron atoms into the diamond film during chemical vapor deposition (CVD) reduces paramagnetic defects (Pdia and Pac centers) by decreasing... (Read more)
- 51. Diamond Relat. Mater. 9, 1057-1060 (2000) , “New paramagnetic centers in annealed high-pressure synthetic diamond”, A. J. Neves, R. Pereira, N. A. Sobolev, M. H. Nazaré, W. Gehlhoff, A. Näser and H. KandaWe report three new paramagnetic centers found in high-pressure synthetic diamond with high nitrogen and nickel content and annealed at 1600°C. Analysis of the spectra has shown that two of the centers, labeled AB1 and AB2, are related to systems with effective spin S=1/2 and the other is... (Read more)
- 52. J. Chem. Phys. 113, 744-750 (2000) , “Dynamic nuclear polarization of diamond. III. Paramagnetic electron relaxation times from enhanced 13C nuclear magnetic resonance signals”, Eduard C. Reynhardt and Grant L. HighIt is shown that by varying pulse lengths and delay times in electron spin resonance microwave pulse sequences, designed to enhance 13C nuclear magnetic resonance signals in diamond, and measuring the resulting 13C nuclear magnetic resonance signal, the paramagnetic impurity... (Read more)
- 53. J. Phys.: Condens. Matter 12, 7807-7817 (2000) , “Electron spin resonance characterization of a divacancy-related centre in CVD diamond”, A. Stesmans, B. Nouwen, K. IakoubovskiiThe electron spin resonance characterization of an undocumented paramagnetic centre in chemical vapour deposited diamond is reported. Successful fitting of the powder pattern-like spectrum characterized the originating defect as an S = 1 centre of spectroscopic splitting factor g =... (Read more)
- 54. Phys. Rev. B 62, 8038-8052 (2000) , “Zeeman effect of electronic Raman lines of acceptors in elemental semiconductors: Boron in blue diamond”, H. Kim, Z. Barticevic, A. K. Ramdas, S. Rodriguez, M. Grimsditch, T. R. AnthonyThe Zeeman effect of the electronic Raman transition from 1s(p3/2):?8 to the 1s(p1/2):?7 spin-orbit partner (??) of boron acceptors in diamond is studied with magnetic field B along [001], [111], or [110]. As many as eight Zeeman components of... (Read more)
- 55. Phys. Rev. B 62, 6587-6597 (2000) , “EPR data on the self-interstitial complex O3 in diamond”, D. C. Hunt, D. J. Twitchen, M. E. Newton, J. M. Baker, J. K. Kirui, J. A. van Wyk, T. R. Anthony, W. F. BanholzerA previously unreported defect, which is labeled O3, has been observed in the EPR spectrum of synthetic type-IIa diamonds irradiated at 100 K with 2 MeV electrons. This defect was not observed in identical diamonds whose temperature during electron irradiation was ?300 K. This center has also been... (Read more)
- 56. Phys. Rev. B 62, 16587-16594 (2000) , “ESR and optical evidence for a Ni vacancy center in CVD diamond”, K. Iakoubovskii, A. Stesmans, B. Nouwen, and G. J. AdriaenssensCharacterization of a series of correlated electron-spin resonance (ESR) and photoluminescence (PL) lines in diamond grown by chemical vapor deposition is reported. The series consists of a set of structured PL bands in the range 1.8–2.3 eV, and ESR lines due to an S=1 center with g=2.0039(1) and... (Read more)
- 57. Phys. Rev. B 61, 9-11 (2000) , “Identification of cobalt on a lattice site in diamond”, D. J. Twitchen, J. M. Baker, and M. E. NewtonWe report the finding of an electron-paramagnetic-resonance (EPR) center, labeled O4, which contains cobalt on a site in the diamond lattice. O4 is observed at low temperatures (<30?K) in high temperature and pressure synthetic diamonds grown with a cobalt containing metal-solvent catalyst after... (Read more)
- 58. Phys. Rev. B 61, 3863-3876 (2000) , “Identification of the neutral carbon ?100?-split interstitial in diamond”, D. C. Hunt, D. J. Twitchen, M. E. Newton, J. M. Baker, T. R. Anthony, W. F. Banholzer, S. S. VagaraliA systematic study has been made of some of the properties of R2, the most dominant paramagnetic defect produced in type-IIa diamond by electron irradiation. R2 has been produced in high-purity synthetic diamonds, which have been irradiated with 2 MeV electrons in a specially developed dewar,... (Read more)
- 59. phys. stat. sol. (a) 181, 83-90 (2000) , “Relative Abundance of Single and Vacancy-Bonded Substitutional Nitrogen in CVD Diamond”, I. I. Vlasov, V. G. Ralchenko, A. V. Khomich, S. V. Nistor, D. Shoemaker, R. A. KhmelnitskiiRelations between the concentrations of neutral (N0) and charged (N+) single-substitutional nitrogen and of nitrogen-vacancy (N-V) complexes in chemical vapour deposited diamond films of 0.2 mm thickness with nitrogen impurity concentration levels of 10 ppm are studied. For... (Read more)
- 60. phys. stat. sol. (a) 181, 5-10 (2000) , “ESR Study of Phosphorus Implanted Type IIa Diamond”, N. Casanova, E. Gheeraert, A. Deneuville, C. Uzan-Saguy, R. KalishCold Implantation and Rapid Annealing (CIRA) at 1050 °C of P in IIa diamond crystal, then further annealing at 1400 °C were performed. EPR signals were obtained in particular (i) around g = 2.003, from “dangling bond†defects whose total concentration increases with the dose and decreases... (Read more)
- 61. phys. stat. sol. (b) 217, 665-684 (2000) , “Paramagnetic Defects”, U. Gerstmann, M. Amkreutz, H. OverhofAb-initio calculations of paramagnetic hyperfine interactions for deep defects in semiconductors provide information about the magnetization density distribution in space. A comparison of theoretical results with corresponding data from magnetic resonance experiments allows to estimate the accuracy... (Read more)
- 62. Diamond Relat. Mater. 8, 2022 (1999) , “Multiple twinning and nitrogen defect center in chemical vapor deposited homoepitaxial diamond”, Chih-Shiue Yan and Yogesh K. VohraHomoepitaxial diamond films were grown on polished {100} faces of single crystal type IIa diamond substrates using microwave plasma assisted chemical vapor deposition system. 14 homoepitaxial diamond films were grown under a variety of substrate temperatures (1000–2000°C), methane... (Read more)
- 63. Diamond Relat. Mater. 8, 1572 (1999) , “Correlation between ND1 optical absorption and the concentration of negative vacancies determined by electron paramagnetic resonance (EPR)”, D. J. Twitchen, D. C. Hunt, V. Smart, M. E. Newton and J. M. BakerElectron paramagnetic resonance (EPR) and optical absorption data on the negative and neutral vacancy in diamond are presented. We determine directly the constant of proportionality between the concentration of V− and the integrated intensity of its zero-phonon line (ND1). Using the standard... (Read more)
- 64. Diamond Relat. Mater. 8, 1569 (1999) , “ESR studies of the negative divacancy in irradiated type-I diamonds”, J. K. Kirui, J. A. van Wyk and M. J. R. HochThe W29 is a defect that forms in all irradiated type-Ib diamonds, and some type-Ia diamonds, in the temperature range in which isolated vacancies are mobile. It anneals out at roughly the same temperatures at which other defects, such as the negative vacancy and the R4 centre, which involve... (Read more)
- 65. Diamond Relat. Mater. 8, 1565 (1999) , “New EPR spectra in diamonds with a high concentration of nitrogen atoms”, V. A. Nadolinny, A. P. Yelisseyev, A. G. Badalyan, J. M. Baker, D. J. Twitchen, M. E. Newton, A. Hofstaetter and B. FeigelsonThe EPR spectrum of a synthetic diamond, containing a high concentration of isolated substitutional nitrogen, NS (the P1 EPR centre), shows in addition to the spectrum of P1 three other features not previously observed in nitrogen containing diamond:1. an ‘allowed’ pair spectrum close... (Read more)
- 66. Diamond Relat. Mater. 8, 1560 (1999) , “Modelling of interstitial-related defects in diamond”, A. MainwoodRadiation damage in diamond is a major experimental research tool and is becoming a technologically important topic. Although the vacancy and its complexes are well understood, the other products, the interstitials, are much less studied. Recent theoretical modelling of defects in diamond has... (Read more)
- 67. Diamond Relat. Mater. 8, 1480 (1999) , “Characteristic defects in CVD diamond: optical and electron paramagnetic resonance study”, M. Nesládek, K. Meykens, K. Haenen, J. Navrátil, C. Quaeyhaegens, L. M. Stals, A. Stesmans, K. Iakoubovskij, G. J Adriaenssens, J. Rosa and M. VanekConstant photocurrent method (CPM), electron paramagnetic resonance (EPR), and infra-red optical absorption (FTIR) techniques are used to study characteristic defects in the gap of free-standing optical-quality CVD diamond. It is shown that the gap density of states (DOS) is very sensitive to... (Read more)
- 68. Diamond Relat. Mater. 8, 1101 (1999) , “Optical spin polarization in the di-<001>-split interstitial (R1) centre in diamond”, D. J. Twitchen, M. E. Newton, J. M. Baker, W. F. Banholzer, T. R. AnthonyIrradiating diamond with electrons or neutrons produces the electron paramagnetic resonance (EPR) R1 centre which has been shown to be a di-001-split interstitial. We report that on cooling below a certain threshold temperature and illuminating with unpolarized light of energy greater than 1.7(1)... (Read more)
- 69. J. Phys.: Condens. Matter 11, 7357 (1999) , “A study of 13C hyperfine structure in the EPR of nickel-nitrogen-containing centres in diamond and correlation with their optical properties”, V. A. Nadolinny, A. P. Yelisseyev, J. M. Baker, M. E. Newton, D. J. Twitchen, S. C. Lawson, O. P. Yuryeva, B. N. FeigelsonElectron paramagnetic resonance (EPR) and optical spectroscopy have been used to determine the structure and electronic state of nickel-nitrogen centres in natural diamonds and in synthetic diamonds enriched in 13C. The latter were grown in an Fe-Ni-C solvent/catalyst system at 1750 K,... (Read more)
- 70. Phys. Rev. B 60, 5417 (1999) , “Magnetic circular dichroism of the 1.404-eV interstitial nickel absorption transition in high-pressure synthetic diamond”, P. W. Mason, F. S. Ham, and G. D. WatkinsA high-resolution magnetic circular dichroism (MCDA) study of the sharp 1.404-eV zero-phonon absorption line associated with interstitial nickel in high-pressure synthetic diamond is reported. A model is presented attributing the absorption to internal transitions within the 3d9... (Read more)
- 71. Phys. Rev. B 60, 5392 (1999) , “EPR spectra of separated pairs of substitutional nitrogen atoms in diamond with a high concentration of nitrogen”, V. A. Nadolinny, A. P. Yelisseyev, J. M. Baker, D. J. Twitchen, M. E. Newton, A. Hofstaetter, B. FeigelsonElectron paramagnetic resonance (EPR) measurements are reported in synthetic diamonds grown in an Fe-Ni-C solvent/catalyst system at 1750 K, under stabilizing pressure, by the temperature gradient method. Such diamonds are known to have high concentrations of nitrogen. EPR spectra have been found in... (Read more)
- 72. Phys. Rev. B 59, 12900 (1999) , “Electron-paramagnetic-resonance measurements on the divacancy defect center R4/W6 in diamond”, D. J. Twitchen, M. E. Newton, J. M. Baker, T. R. Anthony, W. F. BanholzerElectron-paramagnetic-resonance (EPR) studies in radiation damaged diamond enriched to 5% 13C have resulted in the identification of the nearest-neighbor divacancy center. It is the isotopic enrichment, and consequent observation of 13C hyperfine lines, that has permitted the... (Read more)
- 73. Phys. Rev. Lett. 83, 3254 (1999) , “Magnetospectroscopy of Acceptors in “Blue” Diamonds”, H. Kim, A. K. Ramdas, S. Rodriguez, M. Grimsditch, T. R. AnthonyThe Zeeman effect of the Δ′ [1s(p3/2):Γ8→1s(p1/2):Γ7] Raman line of boron acceptors in diamond exhibits the predicted eight components and four transitions within the Γ8 multiplet, discovered under diverse polarization... (Read more)
- 74. phys. stat. sol. (a) 174, 137 (1999) , “Effect of Stress on Optical and ESR Lines in CVD Diamond”, K. Iakoubuvskii, A. Stesmans, G. J. Adriaenssens, R. Provoost, R. E. Silverans, V. RaikoCorrelation between the shape of Raman, photoluminescence (PL) and Electron Spin Resonance (ESR) signals in CVD diamond films was examined for both undoped and nitrogen-doped films. No correlation was observed between the shift of the diamond Raman line and its linewidth, even for the films produced... (Read more)
- 75. phys. stat. sol. (a) 172, 113 (1999) , “On Photocurrent (and EPR) Study of Defect Levels in CVD Diamond”, J. Rosa, M. Van??ek, M. Nesládek, L. M. StalsPhotocurrent spectroscopy is used for studying electronic defect states in the gap of optical-quality CVD diamond. The constant photocurrent method (CPM), allowing to measure the optical (photoionization) cross-section of defects, is applied on samples with a different surface treatment. The... (Read more)
- 76. phys. stat. sol. (b) 215, 109 (1999) , “Zeeman Effect of Lyman Transitions: Electronic Raman Spectrum of Boron Acceptors in Diamond”, H. Kim, R. Vogelgesang, A. K. Ramdas, S. Rodriguez, M. Grimsditch, T. R. AnthonySubstitutional boron impurities in diamond exhibit characteristic Lyman transitions, originating in the lower 1s(p3/2): 8 ground state and terminating in its spin-orbit split 1s(p1/2): 7 counterpart. In addition to the Lyman spectrum observed in the... (Read more)
- 77. phys. stat. sol. (b) 210, 13 (1999) , “Neutral Vacancies in Group-IV Semiconductors”, A. Zywietz, J. Furthmüller, F. BechstedtAb initio plane-wave-supercell calculations are performed for the neutral monovacancies in silicon, silicon carbide and diamond using ultrasoft non-normconserving Vanderbilt pseudopotentials. We study the structure, the energetics and the single-particle energy spectrum. The local symmetry, the... (Read more)
- 78. Physica B 273-274, 651 (1999) , “New paramagnetic defects in synthetic diamonds grown using nickel catalyst”, A. J. Neves, R. Pereira, N. A. Sobolev, M. H. Nazaré, W. Gehlhoff, A. Näser and H. KandaWe report four new EPR spectra found in high-pressure synthetic diamonds with high nitrogen content, grown using nickel, and annealed at 1600°C. Analyzing the complex spectra around g≈2 two trigonal and two orthorhombic defects, all with , were identified from the angular dependence and... (Read more)diamond| EPR| AB1 AB2 AB3 AB4 .inp files: diamond/AB1 diamond/AB2 diamond/AB3 diamond/AB4 | last update: Masatoshi Sasaki
- 79. Physica B 273-274, 647 (1999) , “Transition metals in diamond: experimental and theoretical identification of Co–N complexes”, Karl Johnston, Alison Mainwood, Alan T. Collins, Gordon Davies, Daniel Twitchen, J. M. Baker and Mark NewtonDiamonds grown using a cobalt/iron catalyst and annealed at 1800°C were studied using two experimental techniques. A zero-phonon line, observed in photoluminescence at 2.367 eV, showed the splitting under uniaxial stress characteristic of an optical transition at a defect of trigonal symmetry.... (Read more)
- 80. Physica B 273-274, 644 (1999) , “The production and annealing stages of the self-interstitial (R2) defect in diamond”, D. J. Twitchen, D. C. Hunt, C. Wade, M. E. Newton, J. M. Baker, T. R. Anthony and W. F. BanholzerWe report on the production rate of the neutral 0 0 1-split self-interstitial (measured via the electron paramagnetic resonance (EPR) concentration of the R2 defect) in type IIa diamond irradiated at a controlled and measured sample temperature in the interval 110–350 K with 2 MeV electrons... (Read more)
- 81. Physica B 273-274, 632 (1999) , “Ab initio calculations of hyperfine interactions for vacancy and Ni point defects in diamond”, U. Gerstmann, M. Amkreutz and H. OverhofWe calculate total energies and hyperfine interactions for the VC− ground state and the VC*0 excited state of the vacancy in diamond. The comparison with experimental data shows that the local spin density approximation gives reliable spin densities not only for ground states, but also for... (Read more)
- 82. Physica B 273-274, 624 (1999) , “Jahn–Teller splitting and Zeeman effect of acceptors in diamond”, Hyunjung Kim, S. Rodriguez, M. Grimsditch, T. R. Anthony and A. K. RamdasEmploying the high resolution of a 5+4 tandem Fabry–Pérot interferometer, we discovered that Δ′, the Raman active electronic transition between the spin–orbit split 1s(p3/2) : Γ8 and 1s(p1/2) : Γ7 acceptor ground states, is a doublet for a boron impurity... (Read more)
- 83. Physica B 273-274, 15 (1999) , “Current problems in diamond: towards a quantitative understanding”, Gordon DaviesThis paper discusses three major areas of current work on the properties of point defects in diamond: attempting to introduce a shallow donor centre, studying the rôle of transition metals, and achieving a quantitative understanding of radiation effects. Recent work on the first two topics is... (Read more)
- 84. Physica B 273-274, 113 (1999) , “Electron paramagnetic resonance (EPR) and optical absorption studies of defects created in diamond by electron irradiation damage at 100 and 350 K”, D. J. Twitchen, D. C. Hunt, M. E. Newton, J. M. Baker, T. R. Anthony and W. F. BanholzerWe present a study, using electron paramagnetic resonance (EPR) and optical absorption spectroscopies, of high purity synthetic type IIa diamonds, which have been irradiated with 2 MeV electrons in a specially developed dewar; allowing irradiation at a measured sample temperature down to 100 K, at... (Read more)
- 85. Solid State Commun. 111, 397 (1999) , “EPR of new nickel–nitrogen center in annealed synthetic diamond”, R. I. Mashkovtsev and Yu. N. Pal'yanovIn addition to the NE1 and NE2 centers a new EPR center with S=1/2, which we have labeled the RM1 center, has been found in synthetic diamond grown from the Ni solvent and annealed at 2300 K. The RM1 spectrum appears as a pattern of nine lines with intensity distribution near 1:4:10:16:19:16:10:4:1... (Read more)
- 86. Diamond Relat. Mater. 7, 333 (1998) , “Correlation between optical absorption and EPR in high-pressure diamond grown from a nickel solvent catalyst”, A. T. Collins, H. Kanda, J. Isoya, C. A. J. Ammerlaan, J. A. van WykThere is a general tendency for the magnitude of the W8 electron paramagnetic resonance, attributed to substitutional negatively charged nickel, Nis−, to increase in sympathy with the strengths of the 1.883 eV and 2.51 eV absorption bands in high-pressure synthetic diamond. The ratio of the... (Read more)
- 87. Diamond Relat. Mater. 7, 1558 (1998) , “Relationship between electronic states of nickel-containing centres and donor nitrogen in synthetic and natural diamonds”, V. Nadolinny, A. Yelisseyev, O. Yurjeva, A. Hofstaetter, B. Meyer and B. FeigelsonSome features of the charge transfer process in donor nitrogen and nickel centres on exposure to X-ray and light illumination, have been examined in natural and synthetic diamonds by EPR and optical absorption. Donor nitrogen has been shown to serve as a bulk charge compensator of the paramagnetic... (Read more)
- 88. Diamond Relat. Mater. 7, 1282 (1998) , “A new proposal for the structure of platelets in diamond”, J. M. BakerA new model is proposed for platelets in diamond that is based upon the unambiguously determined molecular structure of the EPR centre known as R1, which comprises two parallel [001] split interstitials at nearest neighbour positions in the plane. The new feature of the model is the structure of... (Read more)
- 89. J. Chem. Phys. 109, 8471 (1998) , “Temperature dependence of spin-spin and spin-lattice relaxation times of paramagnetic nitrogen defects in diamond”, E. C. Reynhardt, G. L. High, J. A. van WykSpin-lattice relaxation times of P1 centers in a suite of two natural type Ib, two synthetic type Ib, and one natural type Ia diamonds were measured at 9.6 GHz as a function of temperature in the range 300 K > T > 4.2 K. An analysis of the results revealed that for three of the diamonds... (Read more)
- 90. J. Phys.: Condens. Matter 10, 9833 (1998) , “Optically detected electron paramagnetic resonance of Ni-related defects in synthetic diamond crystals”, Th. Pawlik, C. Noble, J. -M. SpaethSynthetic diamond crystals grown using a solvent catalyst that contains Ni were studied by optical detection of electron paramagnetic resonance (ODEPR) using the magnetic circular dichroism of the optical absorption (MCDA). The MCDA spectra in the infrared spectral region consist of a... (Read more)
- 91. J. Phys.: Condens. Matter 10, 11781 (1998) , “Electron paramagnetic resonance investigations of nickel defects in natural diamonds”, C. J. Noble, Th. Pawlik, J. -M. SpaethElectron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) spectra of natural blue diamonds from the Argyle mine in Western Australia are reported for the first time. These diamonds are shown to contain the NE2 centre which has been observed primarily in synthetic diamonds... (Read more)
- 92. Materials Lett. 34, 143 (1998) , “Defect formation in electron-irradiated synthetic diamond annealed in the temperature range 820–1120 K”, E. M. Shishonok, V. B. Shipilo, G. P. Popelnuk, I. I. Azarko, A. A. Melnikov and A. R. FilippThe phenomenon of the extreme increase of the concentration of dispersed paramagnetic nitrogen in electron-irradiated synthetic diamond specimens annealed in the temperature range 820–1120 K was revealed. It is established that the order of the reaction responsible for the decrease of... (Read more)
- 93. Phys. Rev. B 57, 2302 (1998) , “EPR and optical studies on polycrystalline diamond films grown by chemical vapor deposition and annealed between 1100 and 1900 K”, D. F. Talbot-Ponsonby, M. E. Newton, J. M. Baker, G. A. Scarsbrook, R. S. Sussmann, A. J. WhiteheadThe affect of annealing polycrystalline chemical vapor deposition (CVD) diamond in vacuo up to 1900 K has been studied using electron paramagnetic resonance (EPR) and infrared absorption. The concentration of the EPR centers at g=2.0028 and the infrared absorption in the CH region are insensitive to... (Read more)
- 94. Phys. Rev. B 57, 2264 (1998) , “Multifrequency EPR, 1H ENDOR, and saturation recovery of paramagnetic defects in diamond films grown by chemical vapor deposition”, D. F. Talbot-Ponsonby, M. E. Newton, J. M. Baker, G. A. Scarsbrook, R. S. Sussmann, A. J. Whitehead, S. PfenningerParamagnetic defects in free-standing polycrystalline chemical vapor deposition (CVD) diamond films have been studied using multifrequency electron paramagnetic resonance (EPR) (1–35 GHz), electron-nuclear double resonance (ENDOR), saturation recovery, and infrared absorption. The results confirm... (Read more)
- 95. phys. stat. sol. (b) 210, 13 (1998) , “Neutral Vacancies in Group-IV Semiconductors”, A. Zywietz, J. Furthmüller, F. BechstedtAb initio plane-wave-supercell calculations are performed for the neutral monovacancies in silicon, silicon carbide and diamond using ultrasoft non-normconserving Vanderbilt pseudopotentials. We study the structure, the energetics and the single-particle energy spectrum. The local symmetry, the... (Read more)
- 96. Appl. Surf. Sci. 117-118, 574 (1997) , “ESR characterization of defects produced in diamond surface by B ion implantation”, Y. Show, F. Matsuoka, T. Izumi, M. Deguchi, M. Kitabatake, H. Sakakima, T. Hirao, Y. Mori, A. Hatta, T. Ito, A. HirakiThe defects produced by B ion implantation into CVD diamond films have been investigated by the electron spin resonance (ESR) method. The ESR analysis revealed the Pac-center (g = 2.003, ΔHPP = 10−16 Oe), which originates from carbon dangling bonds in the non-diamond phase carbon... (Read more)
- 97. Diamond Relat. Mater. 6, 778 (1997) , “Minimization of the defects concentration from boron incorporation in polycrystalline diamond films”, E. Colineau, E. Gheeraert, A. Deneuville, J. Mambou, F. Brunet and J. P. LagrangeElectron spin resonance, Raman diffusion and X-ray diffraction spectra of boron-doped diamond thin films were recorded. Both the signals related to particular defects (ESR, luminescence) or those related to the total concentration of defects (linewidth of the diamond Raman line, width of the X-ray... (Read more)
- 98. Diamond Relat. Mater. 6, 516 (1997) , “Nitrogen doping of diamond by ion implantation”, R. Kalish, C. Uzan-Saguy, B. Philosoph, V. Richter, J. P. Lagrange, E. Gheeraert, A. Deneuville, A. T. CollinsNitrogen doping is used to achieve field emission from diamond, and hence it is important to be able to dope diamond with nitrogen in a controlled way, such as that offered by ion implantation. The procedure developed for optimising p-type doping of diamond by B ion-implantation (cold implantation... (Read more)
- 99. Diamond Relat. Mater. 6, 356 (1997) , “ESR studies of incorporation of phosphorus into high-pressure synthetic diamond”, J. Isoya, H. Kanda, M. Akaishi, Y. Morita, T. OhshimaElectron spin resonance (ESR) signals associated with phosphorus, which should give microscopic evidence of incorporation of phosphorus into the lattice of diamond, have been searched in high-pressure synthetic diamond crystals. In a crystal grown from phosphorus catalyst, a new ESR spectrum... (Read more)
- 100. J. Appl. Phys. 82, 1201 (1997) , “Electron paramagnetic resonance imaging of the distribution of the single substitutional nitrogen impurity through polycrystalline diamond samples grown by chemical vapor deposition”, D. F. Talbot-Ponsonby, M. E. Newton, and J. M. BakerThe distribution of the single substitutional nitrogen impurity (NS0" align="middle">) through the thickness of diamond films grown by chemical vapor deposition has been studied using Electron Paramagnetic Resonance imaging. The design of an Electron Paramagnetic Resonance imaging... (Read more)
- 101. J. Appl. Phys. 81, 234 (1997) , “Characterization of textured polycrystalline diamond by electron spin resonance spectroscopy”, C. F. O. Graeff, C. E. Nebel, M. Stutzmann, A. Flöter, R. ZachaiElectron spin resonance (ESR) is shown to be a useful and versatile technique for the detection and characterization of preferred orientation effects in polycrystalline diamond films. A nitrogen related center known as P1 is used for this purpose. The ESR signal coming from this center is... (Read more)
- 102. J. Phys. D: Appl. Phys. 30, 1790 (1997) , “The dependences of ESR line widths and spin-spin relaxation times of single nitrogen defects on the concentration of nitrogen defects in diamond”, J. A. van Wyk, E. C. Reynhardt, G. L. High, I. Kiflawi
- 103. Nucl. Instrum. Methods Phys. Res. B 127-128, 217 (1997) , “Defects in ion implanted diamond films (ESR study)”, Yoshiyuki Show, Tomio Izumi, Masahiro Deguchi, Makoto Kitabatake, Takashi Hirao, Yusuke Morid, Akimitsu Hatta, Toshimichi Ito and Akio HirakiThe defect structures in ion implanted diamond films have been studied by the electron spin resonance (ESR) method. Two kinds of paramagnetic defect centers were observed in ion implanted layers. One was a carbon dangling bond that existed in crystalline diamond (g = 2.003, ΔHpp = 3 Oe), and... (Read more)
- 104. Phys. Rev. B 56, 6392 (1997) , “EPR identification of the ?100?-split [B-N]+ interstitialcy in diamond”, J. Isoya, H. Kanda, Y. MoritaBased on the 11B and 14N hyperfine interactions determined by using the electron paramagnetic resonance technique, the NIRIM-4 center in electron-irradiated boron-doped synthetic diamond crystal has been identified as a ?100?-split [B-N]+ interstitialcy. The... (Read more)
- 105. Phys. Rev. B 56, 16033 (1997) , “Reply to "Comment on ‘Electronic structure of the N-V center in diamond: Theory’"”, A. Lenef, S. C. RandWe present insights into the electronic structure and relaxation of N-V color centers in diamond which support the contention that Jahn-Teller effects may play a very significant role in the excited E state. We also consider several opposing arguments, but show that the unusual relaxation behavior... (Read more)
- 106. Phys. Rev. B 56, 16031 (1997) , “Comment on "Electronic structure of the N-V center in diamond: Theory"”, J. P. Goss, R. Jones, P. R. Briddon, G. Davies, A. T. Collins, A. Mainwood, J. A. van Wyk, J. M. Baker, M. E. Newton, A. M. Stoneham, S. C. LawsonIt is argued that the model advanced by Lenef and Rand [Phys. Rev. B 53, 13 441 (1996)] for the nitrogen-vacancy center in diamond, exhibiting the 1.945-eV luminescence is incorrect. Lenef and Rand argue that the electronic ground state consists of two electrons occupying a1 states... (Read more)
- 107. Appl. Phys. Lett. 69, 3836 (1996) , “Electron paramagnetic resonance characterization of diamond films fabricated with different methane concentrations”, D. J. Keeble, B. RamakrishnanElectron paramagnetic resonance (EPR) studies were performed on thin diamond films fabricated by hot-filament chemical vapor deposition using methane concentrations varying from 0.25% to 5%. The bulk spin concentration and the peak to peak linewidth for the characteristic g=2.0027(2) EPR... (Read more)
- 108. Appl. Phys. Lett. 69, 3215 (1996) , “Optical excitation of paramagnetic nitrogen in chemical vapor deposited diamond”, C. F. O. Graeff, E. Rohrer, C. E. Nebel, M. Stutzmann, H. Güttler, R. ZachaiInvestigations of polycrystalline chemical vapor deposited diamond films by electron-spin-resonance (ESR), light-induced (L)ESR, and the constant photoconductivity method have identified dispersed substitutional nitrogen (P1 center) as the main paramagnetic form of N incorporated in the CVD diamond.... (Read more)
- 109. Appl. Phys. Lett. 68, 2123 (1996) , “Concentration of paramagnetic centers in boron doped polycrystalline diamond films”, E. Colineau, A. Deneuville, J. Mambou, and E. GheeraertThough no boron signal is identified, with respect to their boron content the narrow and broad components of the electron spin resonance signal in boron doped polycrystalline film decrease from 1018 to 1016 cm 3. This is ascribed to two different structural... (Read more)
- 110. Diamond Relat. Mater. 5, 1113 (1996) , “Spatial distribution of impurity defects in synthetic diamonds obtained by the BARS technology1”, A. Yelisseyev, V. Nadolinny, B. Feigelson, S. Terentyev, S. NosukhinLuminescence and optical transmission topography reveal the inhomogeneities in distribution of impurity nitrogen and nickel-related defects in synthetic diamonds obtained in high-pressure apparatus of the split-sphere type (Russian acronym: BARS). Owing to considerable supersaturations and... (Read more)
- 111. J. Phys.: Condens. Matter 8, 837 (1996) , “An electron paramagnetic resonance investigation of paramagnetic defects in diamond films grown by chemical vapour deposition”, D. F. Talbot-Ponsonby, M. E. Newton, J. M. Baker, G. A. Scarsbrook, R. S. Sussmann, C. J. H. WortDefects in free-standing diamond films grown by microwave-plasma-assisted chemical vapour deposition have been studied by electron paramagnetic resonance (EPR). The EPR spectra observed for the as-grown material each consisted of two distinguishable Lorentzian lines at g = 2.0028(2), along with... (Read more)
- 112. Phys. Rev. B 54, 7881 (1996) , “Hydrogen-related defects in polycrystalline CVD diamond”, X. Zhou, G. D. Watkins, K. M. McNamara Rutledge, R. P. Messmer, S. ChawlaBy simulating the line shapes of a commonly observed S=1/2 electron paramagnetic resonance (EPR) center in polycrystalline chemical vapor deposited (CVD) diamond at 9.8, 14, 20, and 35 GHz, we conclude that the EPR signal, which we label H1, results from a unique defect with a single hydrogen atom... (Read more)
- 113. Phys. Rev. B 54, 7874 (1996) , “Nitrogen-related dopant and defect states in CVD diamond”, E. Rohrer, C. F. O. Graeff, R. Janssen, C. E. Nebel, M. Stutzmann, H. Güttler, R. ZachaiSubbandgap absorption of chemical-vapor-deposition diamond films, with nitrogen contents varying from 10 to 132 ppm has been explored by the constant-photoconductivity method (CPM), photothermal-deflection spectroscopy (PDS) and electron spin resonance (ESR). The spectra measured by PDS increase... (Read more)
- 114. Phys. Rev. B 54, 6988 (1996) , “Electron-paramagnetic-resonance measurements on the di-<001>-split interstitial center (R1) in diamond”, D. J. Twitchen, M. E. Newton, J. M. Baker, O. D. Tucker, T. R. Anthony, W. F. BanholzerElectron-paramagnetic-resonance (EPR) studies in electron-irradiated diamond enriched with 5% 13C have resulted in identification of the di-?001?-split interstitial center. It is the isotopic enrichment and the consequent observation of 13C hyperfine satellites that have... (Read more)
- 115. Phys. Rev. B 53, 13441 (1996) , “Electronic structure of the N-V center in diamond: Theory”, A. Lenef, S. C. RandAb initio calculations have been made of possible excited electronic structure of the N-V center in diamond. Molecular-orbital basis states for a center of C3v symmetry with n=2, 4, or 6 active electrons, which account fully for spin symmetries of the wave functions, were constructed to... (Read more)
- 116. Phys. Rev. B 53, 13427 (1996) , “Electronic structure of the N-V center in diamond: Experiments”, A. Lenef, S. W. Brown, D. A. Redman, S. C. Rand, J. Shigley, E. FritschQuantum-beat spectroscopy has been used to observe excited states of the N-V center in diamond. For the 1.945-eV optical transition, direct evidence is presented for the existence of GHz-scale fine structure, together with a much larger 46-cm-1 level splitting in the E state. An... (Read more)
- 117. phys. stat. sol. (a) 154, 219 (1996) , “Microstructure Evolution and Defect Incorporation in Highly Oriented and Textured CVD Diamond Films”, Y. von Kaenel, J. Stiegler, E. Blank, O. Chauvet, Ch. Hellwig, K. PlamannA series of highly oriented and textured microwave CVD diamond films, where only the deposition time was varied, was deposited on silicon wafers in order to follow the evolution of the microstructure and defect content with film thickness. SEM, XRD, Raman spectroscopy, luminescence measurements, and... (Read more)
- 118. Thin Solid Films 281-282, 275 (1996) , “Formation of paramagnetic defects in CVD diamond films (ESR study)”, Y. Show, Y. Nakamura, T. Izumi, M. Deguchi, M. Kitabatake, T. Hirao, Y. Mori, A. Hatta, T. Ito and A. HirakiParamagnetic defects in CVD (Chemical Vapor Deposition) diamond films were studied using the Electron Spin Resonance (ESR) method. Furthermore, the correlation between defects and electrical resistance of conductive layers on CVD the diamond surface were investigated using ESR and van der Pauw... (Read more)
- 119. Thin Solid Films 274, 50 (1996) , “Structural characterization of CVD diamond films using the ESR method”, Yoshiyuki Show, Mitsuo Iwase and Tomio IzumiThe early deposition stages of diamond films have been studied in detail as a function of growth time, using electron spin resonance methods. The defect center in the non-diamond phase carbon region (g = 2.003, ΔHpp = 8–14 Oe was observed from a sample deposited for 10 min. The defect... (Read more)
- 120. Diamond Relat. Mater. 4, 877 (1995) , “Properties of diffused diamond films with n-type conductivity”, Galina Popovici, M. A. Prelas, T. Sung, S. Khasawinah, A. A. Melnikov, V. S. Varichenko, A. M. Zaitsev, A. V. Denisenko and W. R. FahrnerHigh quality, freestanding "white" CVD diamond films, 230 μm thick, polished on both sides and with resistivity 1014Ω cm were used for diffusion of impurities to obtain n-type conductivity. Diffusion of lithium, oxygen and chlorine was performed under a bias. Auger analysis was... (Read more)
- 121. Diamond Relat. Mater. 4, 508 (1995) , “Effective correlation energies for defects in a-C:H from a comparison of photelectron yield and electron spin resonance experiments”, J. Ristein, J. Schäfer and L. LeyAmorphous hydrogenated carbon films (a-C:H) were deposited by r.f. plasma CVD from methane, varying the self bias potential of the substrate electrode by means of the r.f. power coupled into the discharge. Films were characterized by IR and optical spectroscopy, confirming a transition from... (Read more)
- 122. Diamond Relat. Mater. 4, 177 (1995) , “Photoinduced absorption lines related to nickel impurity in annealed synthetic diamonds”, A. P. Yelisseyev and V. A. NadolinnyThe absorption lines at 539.9, 546.6 and 552.9 nm induced by visible or UV light illumination in synthetic diamonds annealed at T 2000 K and 5.5 GPa have been studied. The lines are associated with two different nitrogen-nickel defects, while the photoinduction effect is a result of internal... (Read more)
- 123. J. Appl. Phys. 78, 7059 (1995) , “Characterization of heavily B-doped polycrystalline diamond films using Raman spectroscopy and electron spin resonance”, P. Gonon, E. Gheeraert, A. Deneuville, F. Fontaine, L. Abello, G. LucazeauHeavily B-doped polycrystalline diamond films ([B]~" align="bottom">1019 cm3) are studied by Raman spectroscopy and electron spin resonance. The formation of an impurity band is accompanied by a Fano-type interference for the one-phonon scattering. Bands at 1200 and 500... (Read more)
- 124. Phys. Rev. B 52, 12657 (1995) , “Magnetic-resonance measurements on the 5A2 excited state of the neutral vacancy in diamond”, J. A. van Wyk, O. D. Tucker, M. E. Newton, J. M. Baker, G. S. Woods, P. SpearThe ground state of the neutral vacancy in diamond is diamagnetic and therefore has not been studied by electron paramagnetic resonance (EPR). We report the observation of EPR from the 5A2 excited state of the neutral vacancy by EPR when illuminating an electron-irradiated... (Read more)
- 125. Phys. Rev. B 51, 16741 (1995) , “Optical detection of magnetic resonance of nitrogen and nickel in high-pressure synthetic diamond”, M. H. Nazare, P. W. Mason, G. D. Watkins, H. KandaDiamonds grown by the temperature-gradient method using a nickel catalyst exhibit a luminescence spectrum that is dominated by a broad band with sharp lines around 2.56 eV. We report optical detection of magnetic resonance of substitutional N0 and substitutional Ni- in this... (Read more)
- 126. Appl. Phys. Lett. 65, 3320 (1994) , “Power saturation and the effect of argon on the electron spin resonance of diamond deposited from a microwave plasma”, P. B. Lukins and J. KhachanElectron spin resonance (ESR) of microwave plasma chemical vapor deposition diamond shows peaks associated with (i) a P1 substitutional nitrogen defect center, (ii) spin-spin interactions between the paramagnetic sites and neighboring protons, and (iii) a possible contribution from graphitic... (Read more)
- 127. Appl. Phys. Lett. 65, 2951 (1994) , “Nitrogen in the isotopically enriched 12C diamond”, S. Zhang, M. E. Zvanut, Y. K. Vohra, S. S. VagaraliAn electron paramagnetic resonance (EPR) characterization study of isotopically enriched 12C diamond grown by General Electric has been carried out. While other commonly used techniques detect no nitrogen in this diamond, the clear EPR spectrum consistently measured a nitrogen... (Read more)
- 128. Appl. Phys. Lett. 65, 2287 (1994) , “Identification of phosphorus in diamond thin films using electron paramagnetic-resonance spectroscopy”, M. E. Zvanut, W. E. Carlos, J. A. Freitas, Jr., K. D. Jamison, R. P. HellmerAn electron paramagnetic-resonance study of diamond films doped by implantation of phosphorus during film deposition is reported. Samples with nominal phosphorus concentration between 1016 and 1017 cm 3 exhibit two isotropic lines of equal intensity separated... (Read more)
- 129. Appl. Phys. Lett. 64, 1091 (1994) , “Electron paramagnetic resonance forbidden transitions from hydrogen in polycrystalline diamond films”, S. H. Holder, L. G. Rowan, J. J. KrebsInvestigation of polycrystalline diamond films by electron paramagnetic resonance at 9.5 and 35 GHZ has revealed the presence of forbidden transitions resulting from a simultaneous microwave induced flipping of unpaired electron spins and environmental nuclear spins. The spacing of the resonance... (Read more)
- 130. Diamond Relat. Mater. 4, 53 (1994) , “Slow emission of the 2.56 eV centre in synthetic diamond”, E. Pereira, L. Santos, L. Pereira, D. M. Hofmann, P. Christmann, W. Stadler and B. K. MeyerThe 2.56 eV luminescence band in synthetic diamond is studied in detail by time resolved photoluminescence and spin resonance measurements. The temperature dependence of the vibronic band shape indicates that between 2 and 20 K there is a noticeable change in relative intensities of the two dominant... (Read more)
- 131. J. Phys.: Condens. Matter 6, 801 (1994) , “EPR of radiation damage centres W11, W12, W13 and W14 in type Ib diamond”, J. A. van WykW11, W12, W13 and W14 are four paramagnetic defects with S=3/2 observed in electron or neutron irradiated type Ib diamonds. Although spin Hamiltonian parameters have been determined that describe the ESR results very well, it will be shown that the normal spin Hamiltonian with... (Read more)
- 132. J. Phys.: Condens. Matter 6, 6721 (1994) , “A perturbed vacancy model for the R1 EPR centre in diamond”, J. E. Lowther, A. MainwoodRadiation damage produces many defects in diamond that are associated with lattice vacancies and interstitial atoms. EPR has proved to be a valuable tool in the characterization of such defects although often detailed models of the defect structure have not been attempted. It is shown that the R1... (Read more)
- 133. J. Phys.: Condens. Matter 6, 551 (1994) , “13C, 14N and 15N ENDOR measurements on the single substitutional nitrogen centre (P1) in diamond”, A. Cox, M. E. Newton, J. M. BakerNew ENDOR measurements on the single substitutional nitrogen centre in diamond are reported. The CW-ENDOR mechanism utilizes cross relaxation, and measurements have been made on both 14N and 15N, as well as the first detailed 13C ENDOR study on the isotope at the... (Read more)
- 134. Phys. Rev. B 50, 17618 (1994) , “Acceptor level of substitutional Ni in diamond”, D. M. Hofmann, M. Ludwig, P. Christmann, D. Volm, B. K. Meyer, L. Pereira, L. Santos, E. PereiraSubstitutional Ni- in synthetic diamonds has been investigated by electron-paramagnetic resonance (EPR) and photo-EPR. The photo-EPR investigation shows that the Ni- EPR signal can be diminished by optical illumination, and the threshold energy of 2.47±0.02 eV suggests that the... (Read more)
- 135. Phys. Rev. B 50, 15586 (1994) , “EPR and 14N electron-nuclear double-resonance measurements on the ionized nearest-neighbor dinitrogen center in diamond”, O. D. Tucker, M. E. Newton, J. M. BakerThe nearest-neighbor substitutional nitrogen center [N-N]0 (A center), is one of the most common defects in natural diamond. [N-N]0 is diamagnetic and therefore cannot be studied by electron paramagnetic resonance (EPR). However, the [N-N]+ center is paramagnetic,... (Read more)
- 136. Phys. Rev. B 49, 15392 (1994) , “g tensor for substitutional nitrogen in diamond”, S. Zhang, S. C. Ke, M. E. Zvanut, H. T. Tohver, Y. K. VohraWe report a measurement of an axially symmetric g tensor for the substitutional nitrogen center in type-IIa synthetic isopure 12C diamond. Because the nitrogen concentration of the diamond studied is exceptionally low the electron-paramagnetic-resonance linewidth is sufficiently narrow to... (Read more)
- 137. Phys. Rev. B 49, 11010 (1994) , “Strongly perturbed negative-vacancy-related centers in diamond”, J. E. Lowther and J. A. van WykSeveral related defect centers have been observed in synthetic and type-Ib diamond following electron or neutron irradiation. Such centers, termed W centers, have similar characteristic features in that all have a spin of S=3/2 and exhibit an extremely large zero-field splitting. Spin-Hamiltonian... (Read more)
- 138. J. Opt. Soc. Am. B 10, 913 (1993) , “Raman-heterodyne-detected nonlinear susceptibility with an arbitrary radio-frequency field strength”, X. -F. He, P. T. H. Fisk, N. B. MansonRaman-heterodyne-detected complex nonlinear susceptibility has been measured and analyzed in detail with a radio-frequency field strength varying from weak to strong. The experiments were carried out on the nitrogen-vacancy color center in diamond involving both nuclear magnetic resonance and electron paramagnetic resonance transitions. The dispersive and the absorptive components of the nonlinear susceptibility are shown to have different saturation behaviors, and an anomalous-amplitude line shape arises where the dispersion component dominates in the response spectrum at high RF powers. The experimental results are found to be in good agreement with theoretical profiles, where no adjustable parameter is included in the calculation. (Read more)
- 139. J. Phys.: Condens. Matter 5, 7929 (1993) , “The R2 EPR centre and 1.685 eV absorption line in diamond”, A. Mainwood, J. E. Lowther, J. A. van WykThe R2 EPR centre and 1.685 eV zero-phonon line seen in the optical absorption spectrum of diamond. have been shown to correlate in intensity and are believed to be associated with the same defect. We propose that the defect responsible is a highly strained vacancy, the origin of strain possibly... (Read more)
- 140. J. Phys.: Condens. Matter 5, 3019 (1993) , “ENDOR of the P2 centre in type-Ia diamonds”, J. A. van Wyk, J. H. N. LoubserThe P2 centre was the first defect observed in diamond with electron spin resonance. Because of a very complicated ESR spectrum many years elapsed before the correct model was determined. Accurate spin Hamiltonian parameters have been determined from extensive ENDOR measurements at room temperature.... (Read more)
- 141. Phys. Rev. B 48, 17595 (1993) , “Nature of the native-defect ESR and hydrogen-dangling-bond centers in thin diamond films”, H. Jia, J. Shinar, D. P. Lang, M. PruskiThe X-band ESR of thin diamond films deposited from a mixture of 99.5% H2 and 0.5% CH4 is compared to those of films similarly prepared from D2-CD4 and H2-13CH4 mixtures. The main line and the satellites at ±7.2 G are... (Read more)
- 142. Phys. Rev. B 47, 8816 (1993) , “Paramagnetic resonance of photoexcited N-V defects in diamond. II. Hyperfine interaction with the 14N nucleus”, X. -F. He, N. B. Manson, P. T. H. FiskHyperfine interactions associated with the 14N nucleus in the diamond N-V defect have been investigated using Raman-heterodyne techniques. The measured nuclear-magnetic-resonance (NMR) and electron-nuclear-double-resonance frequencies were well accounted for by the triplet-spin... (Read more)
- 143. Phys. Rev. B 47, 8809 (1993) , “Paramagnetic resonance of photoexcited N-V defects in diamond. I. Level anticrossing in the 3A ground state”, X. -F. He, N. B. Manson, P. T. H. FiskRaman-heterodyne-detected paramagnetic resonance has been used to study the level anticrossing in the 3A state of the N-V defect in diamond. The electron-paramagnetic-resonance (EPR) frequencies are well accounted for by a triplet-spin Hamiltonian. Comparison of the EPR spectra with the... (Read more)
- 144. Phys. Rev. Lett. 71, 557 (1993) , “Bond-Centered Muonium in Diamond: Resolved Nuclear Hyperfine Structure”, J. W. Schneider, R. F. Kiefl, K. H. Chow, S. Johnston, J. Sonier, T. L. Estle, B. Hitti, R. L. Lichti, S. H. Connell, J. P. E. Sellschop, C. G. Smallman, T. R. Anthony, W. F. BanholzerThe nuclear hyperfine structure of bond-centered muonium in 13C enriched diamond has been resolved using time-differential transverse-field muon spin rotation. The measured nearest-neighbor 13C hyperfine parameters are compared to theoretical values from a recent ab initio... (Read more)
- 145. J. Appl. Phys. 72, 211 (1992) , “Autler–Townes effect of the photoexcited diamond nitrogen-vacancy center in its triplet ground state”, Xing-Fei He, Peter T. H. Fisk, and Neil B. MansonThe AutlerTownes effect in nuclear magnetic resonance (NMR) and electron paramagnetic resonance has been observed using recently developed Raman heterodyne techniques. The measurements were carried out on the nitrogen-vacancy color center in diamond, where the 3A"... (Read more)
- 146. J. Lumin. 53, 88 (1992) , “Frequency-dependent dephasing of N-V centers in diamond”, Eric van Oort and Max GlasbeekIn this paper, we report on high-resolution magneto-optical double-resonance experiments on the 3A →3E zero-phonon line (ZPL) transition of the N-V center in diamond. It is demonstrated that hole burning of the ZPL absorption (at 637 nm) is achieved by resonant microwave excitation of the... (Read more)
- 147. J. Lumin. 53, 49 (1992) , “Raman heterodyne studies of the nitrogen-vacancy centre in diamond”, Neil B. Manson, Xing-Fei He and Peter T. H. FiskThe Raman heterodyne detected EPR and NMR frequencies associated with the nitrogen-vacancy centre in diamond are found to be consistent with those for a spin-triplet ground state with the following spin-Hamiltonian parameters g = 2.0028, gn = 0.4036, D = 2.88 GHz, |A||| = 2.3 MHz, |A| = 2.1 MHz and... (Read more)
- 148. J. Opt. Soc. Am. B 9, 768 (1992) , “Origin of persistent hole burning of N-V centers in diamond”, D. Redman, S. Brown, S. C. RandNew satellite features and antiholes in the persistent hole-burning spectrum of N–V centers in diamond, as well as their dependences on applied electric fields and frequency within the inhomogeneous absorption line, are reported. These results, together with reassignments of spin states of this center, permit an understanding of the origin of the satellite holes as well as of possible mechanisms for the persistent hole-burning phenomenon itself. In addition we report narrow optical interference fringes in heterodyne-detected spectra of persistent spectral holes in the N–V defect center in diamond and discuss a recent suggestion for high-resolution Ramsey-fringe hole-burning spectroscopy of solids based on phase-separated fields. (Read more)
- 149. J. Phys.: Condens. Matter 4, 8119 (1992) , “ENDOR studies on the N1 di-nitrogen centre in diamond”, A. Cox, M. E. Newton, J. M. BakerNew ENDOR measurements on the N1 centre confirm the N-C-N+ model for the defect. The N+ is in a substitutional site with approximately tetrahedral symmetry. The N-C fragment of the centre resembles the P1 centre, with slightly larger unpaired electron density on the nitrogen,... (Read more)
- 150. J. Phys.: Condens. Matter 4, 2651 (1992) , “ENDOR and high-temperature EPR of the N3 centre in natural type Ib diamonds”, J. A. van Wyk, J. H. N. Loubsert, M. E. Newton, J. M. BakerThe N3 is a single paramagnetic electron centre observed in type Ib diamonds. It has monoclinic symmetry below 200 degrees C and becomes axially symmetric at higher temperatures. It displays an unusual hyperfine structure which is shown to be from a single 14N nucleus. The... (Read more)
- 151. Phys. Rev. B 46, 5303 (1992) , “Cross-relaxation effects in the 2.818-eV zero-phonon emission in brown diamond”, I. Hiromitsu, J. Westra, and M. GlasbeekIn brown diamond, the long-lived emission at 2.818 eV is known to be due to a localized center in the photoexcited triplet state. In this paper, the emission intensity of the 2.818-eV center is studied as a function of the strength of an externally applied magnetic field. The cross-relaxation (CR)... (Read more)
- 152. Phys. Rev. B 46, 10600 (1992) , “Cross-relaxation dynamics of the N-V center in diamond as studied via optically detected microwave recovery transients”, I. Hiromitsu, J. Westra, M. GlasbeekThe N-V center in diamond is a nitrogen-vacancy pair defect with an electronic triplet spin ground state. Upon optical excitation and in the presence of an applied magnetic field, two subensembles of N-V centers with different spin temperatures are created at liquid-helium temperatures. For certain... (Read more)
- 153. Phys. Rev. B 45, 5699 (1992) , “Optical detection of magnetic resonance in the photoexcited triplet state of a deep center in diamond”, J. Westra, R. Sitters, and M. GlasbeekFrom an optically detected magnetic resonance study of the 2.818-eV zero-phonon emission in brown diamond, direct evidence for the existence of a photoexcited phosphorescent triplet state in diamond has been obtained. The emission is attributed to a deep-center triplet state with spin-Hamiltonian... (Read more)
- 154. Phys. Rev. B 45, 1436 (1992) , “EPR identification of the negatively charged vacancy in diamond”, J. Isoya, H. Kanda, Y. Uchida, S. C. Lawson, S. Yamasaki, H. Itoh, Y. MoritaElectron-paramagnetic-resonance and electron-nuclear-double-resonance (ENDOR) methods are used to identify the negatively charged state of the isolated vacancy in electron-irradiated synthetic diamond crystals. The Td symmetry is confirmed by determining the arrangement of both nearest... (Read more)
- 155. Appl. Phys. Lett. 59, 1870 (1991) , “Paramagnetic nitrogen in chemical vapor deposition diamond thin films”, M. Hoinkis, E. R. Weber, M. I. Landstrass, M. A. Plano, S. Han, D. R. KaniaElectron-paramagnetic-resonance (EPR) studies demonstrate the presence of nitrogen point defects in microwave-assisted chemical vapor deposition (CVD) diamond thin films. Polycrystalline powder pattern EPR spectra are interpreted with g=2.0023, A=114.0 MHz, and... (Read more)
- 156. J. Lumin. 48-49, 803 (1991) , “Microwave-induced line-narrowing of the N-V defect absorption in diamond”, E. van Oort, B. van der Kamp, R. Sitter and M. GlasbeekFor the diamond N-V center results of optically detected magnetic resonance experiments are reported using narrow-band laser excitation. Strain-induced splittings of the 3A ground state are observed in the ODMR spectra. In addition, an internal strain-induced lifting of the orbital degeneracy in the... (Read more)
- 157. J. Phys.: Condens. Matter 3, 3605 (1991) , “Models for the di-nitrogen centres found in brown diamond”, M. E. Newton, J. M. BakerNo new experiments are reported in this paper: the paper comprises a re-interpretation of published EPR data of the various di-nitrogen centres in brown diamond, including the new ENDOR results of the authors' previous paper on the W7 centre (see ibid., vol.3, p.3591, 1991). The new evidence about... (Read more)
- 158. J. Phys.: Condens. Matter 3, 3591 (1991) , “ENDOR studies on the W7 di-nitrogen centre in brown diamond”, M. E. Newton, J. M. BakerA new technique, involved rapid and repeated sweeping of radio-frequency irradiation through a wide frequency range, has been used to enhance the ENDOR signal of the W7 di-nitrogen centre in diamond. This allowed the determination of the following magnetic hyperfine and electric quadrupole... (Read more)
- 159. Phys. Rev. Lett. 67, 3420 (1991) , “Spin Dynamics and Electronic States of N-V Centers in Diamond by EPR and Four-Wave-Mixing Spectroscopy”, D. A. Redman, S. Brown, R. H. Sands, S. C. RandA new phase-modulation technique for nonlinear laser spectroscopy is applied with a relative resolving power in the sub-Hz range to measure fundamental relaxation processes of the N-V center in diamond. Complementary EPR experiments versus temperature establish the spin character of the ground state... (Read more)
- 160. Sov. Phys. Solid State 33, 1409 (1991) , “Electron paramagnetic resonance of phosphorus in diamond”, N. D. Samsonenko, V. V. Toki?, S. V. Gorban’
- 161. J. Lumin. 45, 26 (1990) , “ANOMALOUS LINESHAPES IN RAMAN HETERODYNE DETECTED EPR”, P. T. H. Fisk, X. -F. He, K. Holliday and N. B. MansonAn unusual lineshape has been observed in the Raman heterodyne NMR and EPR signals associated with a nitrogen-vacancy centre in diamond. This lineshape is shown to result from power broadening effects and can be expected as a general result from any Raman heterodyne signal where the transition under... (Read more)
- 162. Opt. Lett. 15, 983 (1990) , “Raman heterodyne detection of electron paramagnetic resonance”, K. Holliday, X. -F. He, P. T. H. Fisk, N. B. MansonWe report the detection of an electron paramagnetic resonance signal using Raman heterodyne spectroscopy, a rf –optical double-resonance technique. The signals are associated with the nitrogen-vacancy center in diamond, which has a spin-triplet ground state. A three-line spectrum associated with the nitrogen hyperfine structure is observed for various magnetic field strengths and crystal orientations. (Read more)
- 163. Opt. Lett. 15, 1094 (1990) , “Raman heterodyne detected electron-nuclear-double-resonance measurements of the nitrogen-vacancy center in diamond”, N. B. Manson, X. -F. He, P. T. H. FiskWe report two new applications of the Raman heterodyne detection technique. Raman heterodyne detected electron-nuclear double resonance and a double rf resonance technique are used to obtain the hyperfine structure of the nitrogen-vacancy center in diamond. (Read more)
- 164. Phys. Rev. B 42, 9843 (1990) , “EPR studies of interstitial Ni centers in synthetic diamond crystals”, J. Isoya, H. Kanda, Y. UchidaTwo new electron-paramagnetic-resonance (EPR) spectra, tentatively labeled NIRIM-1 and NIRIM-2, have been studied using synthetic diamond crystals grown from the Ni solvent to which various amounts of nitrogen getters (Ti, Zr) and/or boron were added. The NIRIM-1 spectrum (g=2.0112) having the... (Read more)diamond| EPR| NIRIM1 NIRIM2 .inp files: diamond/NIRIM1 diamond/NIRIM2 | last update: Masatoshi Sasaki
- 165. Phys. Rev. B 42, 8605 (1990) , “Low-field optically detected magnetic resonance of a coupled triplet-doublet defect pair in diamond”, Eric van Oort, Paul Stroomer, and Max GlasbeekMicrowave-induced changes in the optical emission of the N-V center in diamond have previously been attributed to magnetic resonance of the defect in its 3A ground state [E. van Oort et al., J. Phys. C 21, 4385 (1988)]. In this paper, the focus is on the origin of the hyperfine splittings... (Read more)
- 166. Phys. Rev. B 41, 3905 (1990) , “Fourier-transform and continuous-wave EPR studies of nickel in synthetic diamond: Site and spin multiplicity”, J. Isoya, H. Kanda, J. R. Norris, J. Tang, M. K. BowmanPulsed, Fourier-transform, and continuous-wave electron paramagnetic resonance methods are used to study the g=2.0319 EPR signal in synthetic diamond crystals. This signal is from Ni which is found to be located at a substitutional site in the diamond lattice without detectable nearby charge... (Read more)
- 167. phys. stat. sol. (a) 121, 63 (1990) , “Point Paramagnetic Defects in Diamond Irradiated by High-Energy Ions”, D. P. Erchak, R. B. Grelfand, N. M. Penina, V. F. Stelmakh, V. P. Tolstykh, A. G. Ulyashin, V. S. Varichenko, A. M. ZaitsevA series of highly oriented and textured microwave CVD diamond films, where only the deposition time was varied, was deposited on silicon wafers in order to follow the evolution of the microstructure and defect content with film thickness. SEM, XRD, Raman spectroscopy, luminescence measurements, and... (Read more)
- 168. J. Phys.: Condens. Matter 1, 9801 (1989) , “14N ENDOR of the N2 centre in diamond”, M. E. Newton, J. M. Baker14N ENDOR in the N2 centre in diamond demonstrates that nitrogen is a constituent of the centre. (Read more)
- 169. J. Phys.: Condens. Matter 1, 10549 (1989) , “14N ENDOR of the OK1 centre in natural type Ib diamond”, M. E. Newton, J. M. BakerAn ENDOR investigation has confirmed that the OK1 centre is a low-symmetry ( sigma h) centre, incorporating a single nitrogen atom. The 14N hyperfine and quadrupole coupling matrices have been determined by fitting the data to an exact solution of the energy matrix. Using this... (Read more)
- 170. Phys. Rev. B 40, 6509 (1989) , “Cross-relaxation dynamics of optically excited N-V centers in diamond”, E. van Oort, M. GlasbeekUpon the cw optical excitation of N-V centers in diamond, a spin alignment in the ensemble of nonexcited N-V defects in the electron spin-triplet ground state is induced. When the diamond sample is subjected to magnetic fields of suitable directions and strengths, cross relaxation (CR) and level... (Read more)
- 171. J. Phys. C: Solid State Phys. 21, 4385 (1988) , “Optically detected spin coherence of the diamond N-V centre in its triplet ground state”, E. van Oort, N. B. Manson, M. GlasbeekFor the N-V centre in type Ib diamond the optical detection of spin coherence in the 3A state is reported. The 3A-state lifetime is studied as a function of the light intensity used for the optical excitation of the N-V centre by means of spin-locking experiments. The... (Read more)
- 172. Jpn. J. Appl. Phys. 27, 1808 (1988) , “ESR in Diamond Thin Films Synthesized by Microwave Plasma Chemical Vapor Deposition”, I. Watanabe, K. SugataA variety of diamond films of poor and good quality are synthesized by microwave plasma CVD from a mixture of hydrogen and CH4, CH3OH or C2H5OH. A comparative study on the ESR and Raman spectra of these films is performed. The diamond films of good quality... (Read more)
- 173. Phys. Rev. B 38, 4388 (1988) , “Sign of the hyperfine parameters of anomalous muonium in diamond”, W. Odermatt, Hp. Baumeler, H. Keller, W. Kündig, B. D. Patterson, J. W. Schneider, J. P. F. Sellschop, M. C. Stemmet, S. Connell, D. P. SpencerObservations with the muon-spin-rotation (?SR) technique of the thermally activated transition from the isotropic muonium state Mu to the anisotropic muonium state Mu* in diamond are used to determine the sign of the Mu* hyperfine constants. It is found that the isotropic part... (Read more)
- 174. J. Phys. C: Solid State Phys. 18, 2623 (1985) , “Magnetic resonance spectroscopy in semiconducting diamond”, C. A. J. Ammerlaan, R. van KempIn type-IIb semiconducting diamond an electron paramagnetic resonance spectrum, which is labelled C-NL1, is observed. For detection of the resonance low sample temperatures (T<4K) and the application of a large uniaxial stress (P approximately=1 GPa) are required. The spectrum can be analysed... (Read more)
- 175. J. Phys. C: Solid State Phys. 17, L233 (1984) , “Persistent spectral hole burning of colour centres in diamond”, R. T. Harley, M. J. Henderson, R. M. MacfarlaneFour zero-phonon lines of defect centres in diamond (GR1 (741 nm), N-V (637 nm), H4 (496 nm) and N3 (415 nm)) have been shown to exhibit persistent spectral hole burning. The phenomenon appears to be a rather general one in diamond and should prove very powerful for elucidation of the nature of... (Read more)
- 176. J. Phys. C: Solid State Phys. 16, 1501 (1983) , “Electron spin resonance of a di-nitrogen centre in Cape yellow type Ia diamonds”, J. A. van Wyk, J. H. N. LoubserA di-nitrogen centre has been observed in gem quality Cape yellow diamonds while illuminated with ultraviolet light. Analysis of the spectrum shows that the paramagnetic electron is localised on two neighbouring nitrogens along (111) directions, which suggests that it is most likely a derivative of... (Read more)
- 177. J. Phys. C: Solid State Phys. 15, L981 (1982) , “Carbon-12 hyperfine interaction of the unique carbon of the P2 (ESR) or N3 (optical) centre in diamond”, J. A. van WykThe latest model proposed for the P2 centre shows that the paramagnetic electron is associated mainly with one carbon atom. The observation of the carbon-13 hyperfine interaction with this carbon is reported, and the appropriate hyperfine parameters for this interaction are given. (Read more)
- 178. J. Phys. D: Appl. Phys. 15, L183 (1982) , “Optically active nickel in synthetic diamond”, A. T. Collins, P. M. SpearDiamonds grown using a nickel catalyst-solvent have vibronic absorption systems with zero-phonon lines at 1.883 and 2.51 eV, and show absorption at the Raman frequency (1332 cm-1) in the defect-induced one-phonon absorption spectrum. Circumstantial evidence suggests that these... (Read more)
- 179. Phys. Rev. A 25, 1272 (1982) , “Muonium in diamond”, E. Holzschuh, W. Kündig, P. F. Meier, B. D. Patterson, J. P. F. Sellschop, M. C. Stemmet, H. AppelTwo muonium states have been found in diamond. "Normal" muonium shows an isotropic hyperfine interaction with a coupling constant A/h=3711±21 MHz. "Anomalous" muonium is described by a ?111? axially symmetric spin Hamiltonian with coupling constants extrapolated to 0 K |A?|/h=167.98±0.06... (Read more)
- 180. Phys. Rev. Lett. 47, 954 (1981) , “Reorientation of Nitrogen in Type-Ib Diamond by Thermal Excitation and Tunneling”, C. A. J. Ammerlaan, E. A. BurgemeisterThe rate of anneal of stress-induced ordering of isolated substitutional nitrogen impurities in diamond, measured in the temperature range 78 K<T<200 K, shows large deviations from Arrhenius-type behavior. It is concluded that in the temperature range considered, reorientation of the centers... (Read more)
- 181. Solid State Commun. 30, 211 (1979) , “IMAGING OF PARAMAGNETIC CENTRES IN DIAMOND”, M. J. R. Hoch and A. R. DayAn imaging method for determining the spatial distribution of paramagnetic nitrogen centres in diamond is described. Results are presented for a sample consisting of two small type IB diamonds. (Read more)
- 182. phys. stat. sol. (a) 50, 237 (1978) , “High-Temperature Ion Implantation in Diamond”, Y. H. Lee, P. R. Brosious, J. W. CorbettC+ and N+ implantation into type IIa diamond are performed at various temperatures (25 to 1000°C) and ion-induced damage is studied by EPR measurements at 1.2 to 300 K. Hot implantation at 1000°C results in a reduced spin density of “amorphous†carbon by an order of... (Read more)
- 183. Solid State Commun. 26, 255 (1978) , “EPR STUDIES OF A TWO-NITROGEN-ATOM CENTRE IN NATURAL, PLASTICALLY-DEFORMED DIAMOND”, C. M. WelbournThe hyperfine structure of an EPR system in a natural, brown diamond implies that the system is due to a centre containing two nitrogen atoms on almost equivalent sites. X-ray topographic evidence shows that the sample has been plastically deformed and it is suggested that a possible model for the... (Read more)
- 184. Sov. Phys. Solid State 20, 178 (1978) , “Influence of temperature on spin-spin interaction of nitrogen and nickel centers in diamond”, V. K. Bezobchuk, A. B. Brik, I. V. Matyash, Yu. V. Fedotov
- 185. Solid State Commun. 22, 767 (1977) , “ESR STUDIES OF DIAMOND POWDERS”, J. H. N. LoubserThe ESR spectrum of two defect centres were observed in finely ground diamond powders (0.5 to 30 μm size). The one centre has been seen before in irradiated and annealed single crystals of natural diamonds (the O1 centre) while the second one has only been seen in synthetic diamonds grown from... (Read more)
- 186. Sov. Phys. Solid State 18, 1883 (1976) , “Spin-lattice relaxation of a Jahn-Teller nitrogen center in diamond”, I. M. Zaritskii, V. Ya. Bratus’, V. S. Vikhnin, A. S. Vishnevskii, A. A. Konchits, V. M. Ustintsev
- 187. Jpn. J. Appl. Phys. 14, 544 (1975) , “Study of Defects Introduced by Ion Implantation in Diamond”, J. -F. Morhange, R. Beserman, J. C. BourgoinNatural type IIa diamonds have been implanted with 70 keV carbon, nitrogen and boron ions. The behaviour of the defects introduced is monitored using electron paramagnetic resonance, absorption, luminescence and Raman scattering measurements. We first describe and discuss the applicability of these... (Read more)
- 188. Sov. Phys. Solid State 17, 991 (1975) , “Electron spin resonance of Co2+ ions in synthetic diamonds”, V. S. Bagdasaryan, É. A. Markosyan, M. A. Matosyan, O. S. Torosyan, E. G. Sharoyan
- 189. Sov. Phys. Solid State 16, 2118 (1975) , “Electron paramagnetic resonance spectrum and the infrared absorption of diamonds doped with nitrogen isotopes”, Yu. A. Klyuev, V. I. Nepsha, A. M. Naletov
- 190. Sov. Phys. Solid State 16, 1377 (1975) , “Cross relaxation in ESR spectra of synthetic diamonds”, L. A. Shul’man, G. A. Podzyarei
- 191. phys. stat. sol. (a) 25, 541 (1974) , “Electron Paramagnetic Resonance in Diamond Implanted at Various Energies and Temperatures”, P. R. Brosious, Y. H. Lee, J. W. Corbett, L. J. ChengAmorphous carbon layer EPR measurements have been fitted to a model which predicts the critical fluences at which the layer forms for any temperature and ion species; it predicts the layer will not form during nitrogen ion implantation in diamond above 1031°K. A new anisotropic EPR spectrum labeled D-A4 is observed after hot-implantation (650°C) with nitrogen ions. It is thought to be a spin-one-center arising from a small D-tensor interaction with <111> symmetry. Hot implantation suppresses the formation of the amorphous layer and enhances creation of crystalline lattice defects. (Read more)
- 192. phys. stat. sol. (a) 21, 677 (1974) , “EPR Measurements in Ion-Implanted Diamond”, P. R. Brosious, J. W. Corbett, J. C. BourgoinA new EPR spectrum, arising from defects in diamond created by boron, carbon, and nitrogen ion-implantation, is observed. The spectrum, lattice damage production, and annealing of damage are discussed and are ascribed to amorphous carbon. (Read more)
- 193. Sov. Phys. Solid State 14, 1521 (1972) , “EXCHANGE BROADENING OF THE HYPERFINE COMPONENTS OF THE ESR SPECTRUM OF NITROGEN IN DIAMOND”, L. A. Shul’man, G. A. Podzyarei
- 194. Sov. Phys. Solid State 13, 1809 (1972) , “DEFECTS IN SYNTHETIC DIAMOND POWDERS AND THE DYNAMIC JAHN-TELLER EFFECT”, Yu. A. Bratashevskii, F. N. Bukhan’ko, N. D. Samsonenko, O. Z. Shapiro
- 195. J. Appl. Phys. 42, 722 (1971) , “New S = 1 EPR Center in Irradiated Diamond”, Y. M. Kim, G. D. WatkinsElectron spin resonance studies have been made of natural diamond crystals electron-irradiated at room temperature. A radiation-induced spectrum is identified as arising from a new anisotropic S=1 center. The S=1 center is characterized by: g1=2.0026,... (Read more)
- 196. Solid State Commun. 9, 313 (1971) , “ELECTRON SPIN RESONANCE OF SPIN S = 1 STATES IN UNIRRADIATED DIAMONDS”, Thomas SzendreiThree types of paramagnetic centres with effective spin S = 1 have been detected in natural unirradiated type Ib diamonds. The values of the zero field spitting are 200 oe, 220 oe and 246 oe. (Read more)
- 197. Sov. Phys. Solid State 13, 281 (1971) , “ELECTRON PARAMAGNETIC RESONANCE OF NITROGEN-ALUMINUM PAIRS IN DIAMOND”, M. Ya. Shcherbakova, E. V. Soboleva, N. D. Samsonenko, V. A. Nadolinnyi, P. V. Schastnev, A. G. Semenov
- 198. Sov. Phys. Solid State 12, 2303 (1971) , “EFFECT OF THE SPIN-SPIN RESERVOIR ON SATURATION OF THE NITROGEN EPR LINE IN DIAMOND”, L. A. Shul’man, A. B. Brik, T. A. Nachal’naya, G. A. Podzyarei
- 199. J. Appl. Phys. 41, 2977 (1970) , “Analysis of an Electron Spin Resonance Spectrum in Natural Diamonds”, P. E. Klingsporn, M. D. Bell, and W. J. LeivoAn anisotropic electron spin resonance spectrum was observed in three natural Type Ib diamonds. The diamonds which exhibit the spectrum also show the spectrum from substitutional nitrogen donors previously observed by others. The spectrum consists of three anisotropic groups of lines. The spectrum... (Read more)
- 200. Sov. Phys. Solid State 11, 1104 (1969) , “ELECTRON PARAMAGNETIC RESONANCE OF IONIZED NITROGEN PAIRS IN DIAMOND”, M. Ya. Shcherbakova, E. V. Sobolev, N. D. Samsonenko, V. K. Aksenov
- 201. Sov. Phys. Solid State 10, 1789 (1969) , “THE STATE OF NITROGEN IMPURITIES IN SYNTHETIC DIAMONDS”, E. V. Sobolev, Yu. A. Litvin, N. D. Samsonenko, V. E. Il’in, S. V. Lenskaya, V. P. Butuzov
- 202. Sov. Phys. Solid State 9, 1545 (1968) , “EXCHANGE PAIRS OF NITROGEN IMPURITIES IN DIAMOND”, L. A. Shul’man, I. M. Zaritskii, K. A. Tikhonenko
- 203. Brit. J. Appl. Phys. 18, 1029 (1967) , “The dynamic Jahn - Teller and other effects in the high-temperature electron spin resonance spectrum of nitrogen in diamond”, J. H. N. Loubser, W. P. van RyneveldThe re-orientation of the Jahn-Teller distortion of the C-N bond in diamond containing substitutional nitrogen was observed, through its effect on shape of the hyperfine lines of the nitrogen electron spin resonance spectrum, in the range 600-1230°K. The weak satellite lines due to... (Read more)
- 204. J. Appl. Phys. 38, 337 (1967) , “Electron Spin Resonance in Semiconducting Diamonds”, M. D. BellElectron spin resonance (ESR) was studied in five semiconducting diamonds in the temperature range 108°370°K and at 4.2°K. The g factor is 2.0030±0.0003, and the linewidth varies from 0.3 to 8 Oe at room temperature. The number of spins contributing to the ESR... (Read more)
- 205. Sov. Phys. Solid State 8, 1842 (1967) , “REORIENTATION OF THE JAHN-TELLER DISTORTION IN NITROGEN IMPURITY CENTERS IN DIAMOND”, L. A. Shul’man, I. M. Zaritskii, G. A. Podzyarei
- 206. Nature 210, 692 (1966) , “DISTRIBUTION OF SUBSTITUTIONAL NITROGEN DONORS IN SYNTHETIC DIAMONDS”, M. J. A. Smith, B. R. Angel, R. G. EmmonsConsiderable attention has been devoted to the study of nitrogen impurity in natural diamonds using the technique of electron spin resonance1-3. The spectrum obtained in due to the unpaired electron provided by the substitutional nitrogen atom and the main feature is a triplet at g = 2.0024 caused by interaction with the nitrogen nucleus which has a spin of unity. The distribution of nitrogen is variable and would seem to depend on the method by which the diamond was formed. (Read more)
- 207. Nature 210, 1037 (1966) , “Electron Spin Resonance Spectra associated with Nitrogen in Diamonds”, H. J. Bower, M. C. R. SymonsMANY diamonds show an electron spin resonance spectrum which has been attributed to the presence of single nitrogen atoms substituted for carbon at a diamond lattice site. Smith etal.1 found four types of nitrogen donors, equally abundant and differing only in their hyperfine axes, these being the four C–N bond directions. They measured the hyperfine coupling constants for 14N(I=1), and for 13C(I = ½) in the nearest neighbour positions (denoted centre I). Loubser and du Preez2 found additional lines in the spectrum, which they attributed to interaction of the unpaired electron with carbon-13 at other lattice sites (centres II, III and IV). The hyperfine coupling constants are recorded in Table 1, together with the orbital populations. These populations were obtained using values of |ψ2s(0)|2 and
-3>2p calculated from self-consistent-field atomic wave functions derived by Mayers and by Roothaan and Clementi (see ref. 3). (We have omitted any correction for the δ+ charge on nitrogen and the δ- charge on carbon: this would increase the spin density on carbon at the expense of the nitrogen.) (Read more) - 208. Brit. J. Appl. Phys. 16, 457 (1965) , “New lines in the electron spin resonance spectrum of substitutional nitrogen donors in diamond”, J. H. N. Loubser, L. du PreezThe electron spin resonance lines of nitrogen impurity in diamond found by Smith, Sorokin, Gelles and Lasher have been re-examined in special samples and at low energy densities. (Read more)
- 209. J. Chem. Phys. 42, 1898 (1965) , “Irradiation Damage in Type I Diamond”, H. B. Dyer and L. du PreezIn addition to the GRI and uv bands induced in all diamond by 0.78-MeV electron irradiation, another optical absorption feature, which we have named the ND1 band, is found in all Type I diamonds. A single EPR line appears to be associated with the ND1 band.It is suggested that the ND1 center arises... (Read more)
- 210. Solid State Commun. 3, 307 (1965) , “EXCHANGE INTERACTION EFFECTS IN THE E.S.R. SPECTRUM OF SUBSTITUTIONAL NITROGEN IN DIAMOND”, J. H. N. Loubser, W. P. van Ryneveld and L. du PreezThe E.S.R. lines due to substitutional nitrogen in synthetic diamond powders, heavily doped with nitrogen, were found to exhibit the characteristic features of exchange interaction. In the coats of natural diamonds additional lines due to exchange interaction between triads of nitrogen atoms were... (Read more)
- 211. Sov. Phys. Solid State 6, 2460 (1965) , “DISTRIBUTION OF PARAMAGNETIC NITROGEN CENTERS IN SOME TYPE-I DIAMONDS”, N. D. Samsonenko
- 212. Nature 198, 981 (1963) , “Electron Spin Resonance in Neutron-irradiated Diamond”, E. A. Faulkner, E. W. J. Mitchell, P. W. WhippeyRecent work has shown that the nature of the electron spin resonance spectrum observed in irradiated diamond depends on the type and amount of irradiation. Faulkner and Lomer used comparatively heavy doses of 2-MeV electrons (up to 8×1019 electron cm-3) and distinguished four systems, all of which show a g-value which is isotropic and equal to the free-spin value within 0-2 per cent: (a) asingle line of width about 5 gauss; (b) a system of 24 lines with symmentry axes near the <221> directions, and a D-value of 0-14 cm-1; (c) a system of 6 lines with symmentry axes along the <100> directions and a D-value of 0-14 cm-1; (d) a broad absorption with a half-power width of about 70 gauss, showing a complicated anisotropic structure. (Read more)
- 213. Phys. Rev. Lett. 10, 220 (1963) , “ELECTRON PARAMAGNETIC RESONANCE INVESTIGATION OF THE VACANCY IN DIAMOND”, John A. Baldwin, Jr.Griffiths, Owen, and Ward reported that diamonds exposed to reactor neutrons developed an intense isotropic electron paramagnetic resonance (EPR) absorption lone whose g value was very close to that of the free electron. They found that a similar line was produced by 1-MeV electrons. The work herein... (Read more)
- 214. Nature 194, 829 (1962) , “DIAMONDS CONTAINING CONTROLLABLE IMPURITY CONCENTRATIONS”, C. M. Huggins, P. CannonThe presence of cosiderable quantities of impurities in natural diamond has recently been confirmed1,2. This led Frank3 to remark that multiple techniques of examination must be used on such material. In view of the report of Yoneda4 concerning possible effects of nitrogen on the X-ray diffraction patterns of diamond, it seems worth-while to us to comment further on some of the results which we have gained by the deliberate introduction of a given impurity into laboratory-grown diamond. We shall limit ourselves to a qualitative examination of the electron spin resonance spectra of a few specimens, in the belief that the profundity of the effects suffices to establish that progress in this area is now limited by the composition variability of natural diamond. (Read more)
- 215. J. Appl. Phys. 32, 1854 (1961) , “Paramagnetic Resonance of Defects Introduced Near the Surface of Solids by Mechanical Damage”, G. K. Walters and T. L. EstleElectron spin resonance characteristics of a number of materials subjected to violent mechanical treatment are reported. A line with g=2.0055 observed in silicon is attributed to defects introduced near the surface by mechanical damage. The resonance properties are uninfluenced by... (Read more)
- 216. Phys. Rev. 118, 939 (1960) , “Cross Relaxation Studies in Diamond”, P. P. Sorokin, G. J. Lasher, and I. L. GellesA microwave double resonance experiment performed on the paramagnetic nitrogen centers in diamond shows that in this system cross relaxation occurs via a four spin flip mechanism which exactly conserves Zeeman energy. In this process, which was first postulated by Bloembergen and co-workers in their... (Read more)
- 217. Phys. Rev. 115, 1546 (1959) , “Electron-Spin Resonance of Nitrogen Donors in Diamond”, W. V. Smith, P. P. Sorokin, I. L. Gelles, and G. J. LasherElectron-spin resonance of bound substitutional nitrogen donors in diamond is observed and discussed. The g factor is isotropic at 2.0024±0.0005. For a given donor, one of the C-N bond directions is a hyperfine axis with constants A=40.8 oersteds, B=29.2 oersteds. There are thus four types of... (Read more)
- 218. Phys. Rev. Lett. 2, 39 (1959) , “ELECTRON SPIN RESONANCE OF ACCEPTOR STATES IN DIAMOND”, W. V. Smith, I. L. Gelles, and P. P. SorokinPrevious work reporting electron spin resonance in diamond has been concerned exclusively with paramagnetic centers produced by irradiation with fast neutrons. Using standard resonance techniques we have recently detected at room temperature a family of weak, narrow resonance lines near g=2... (Read more)
- 219. Nature 173, 439 (1954) , “PARAMAGNETIC RESONANCE IN NEUTRON-IRRADIATED DIAMOND AND SMOKY QUARITZ”, Dr. J. H. E. Griffiths, J. Owen, I. M. WardThe nature of lattice defects in neutron-irradiated diamond is a problem of current interest. These defects are known to cause changes in some of the physical properties1 and give rise to a paramagnetic absorption spectrum. We have measured this spectrum in the temperature-range 20º-290ºK., using wave-lengths of 1-2 and 3-1 cm. There are many closely spaced lines, of which two main types can be distinguished. (Read more)
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