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- 1. J. Appl. Phys. 99, 113520 (2006) , “Effects of hydrogen bond redistribution on photoluminescence of a-SiC:H films under thermal treatment”, A. V. Vasin, S. P. Kolesnik, A. A. Konchits, V. I. Kushnirenko, V. S. Lysenko, A. N. Nazarov, A. V. Rusavsky, and S. AshokHydrogenated amorphous silicon carbide (a-SiC:H) films have been deposited using magnetron sputtering technique. An integrated investigation of the effect of vacuum annealing temperature on photoluminescence properties and paramagnetic defects and its correlation with structural... (Read more)
- 2. J. Appl. Phys. 99, 073709 (2006) , “Optical and electron paramagnetic resonance spectroscopies of diffusion-doped Co2+:ZnSe”, Ming Luo, N. Y. Garces, N. C. Giles, Utpal N. Roy, Yunlong Cui, and Arnold BurgerThe efficacy of diffusing cobalt into window-grade polycrystalline ZnSe during high-temperature anneals has been studied. Absorption, photoluminescence (PL), time-resolved PL, and electron paramagnetic resonance (EPR) were used to characterize samples with cobalt concentrations ranging from... (Read more)
- 3. J. Phys. Chem. Solids 67, 789 (2006) , “Spectroscopic and magnetic studies of manganese ions in ZnO–Sb2O3–B2O3 glass system”, M. Srinivasa Reddy, G. Murali Krishna , N. VeeraiahZnO–Sb2O3–B2O3 glasses containing different concentrations of MnO ranging from 0 to 1.0 mol% were prepared. A number of studies, viz. optical absorption, infrared and ESR spectra and magnetic susceptibility, were carried out as a function of manganese ion concentration. The analysis of... (Read more)
- 4. Phys. Rev. B 74, 165202 (2006) , “Structural and electronic properties of Fe3+ and Fe2+ centers in GaN from optical and EPR experiments”, E. Malguth, A. Hoffmann, W. Gehlhoff, O. Gelhausen, M. R. Phillips, and X. XuThis work provides a consistent picture of the structural, optical, and electronic properties of Fe-doped GaN. A set of high-quality GaN crystals doped with Fe at concentrations ranging from 5×1017 cm3 to 2×1020 cm3 is... (Read more)
- 5. Phys. Rev. Lett. 96, 145501 (2006) , “Identification of the Carbon Antisite-Vacancy Pair in 4H-SiC”, T. Umeda, N. T. Son, J. Isoya, E. Janzn, T. Ohshima, N. Morishita, H. Itoh, A. Gali, M. BockstedteThe metastability of vacancies was theoretically predicted for several compound semiconductors alongside their transformation into the antisite-vacancy pair counterpart; however, no experiment to date has unambiguously confirmed the existence of antisite-vacancy pairs. Using electron paramagnetic resonance and first principles calculations we identify the SI5 center as the carbon antisite-vacancy pair in the negative charge state (CSiVC-) in 4H-SiC. We suggest that this defect is a strong carrier-compensating center in n-type or high-purity semi-insulating SiC. (Read more)SiC| ENDOR EPR Theory electron-irradiation optical-spectroscopy thermal-meas./anneal-exp.| -1 -2 1.0eV~ 13C 29Si C1h C3v Carbon Csi EI5/6 HEI1 HEI5/6 Nitrogen P6/7 SI5 Silicon Vc antisite bistable/metastable dangling-bond n-type pair(=2) semi-insulating vacancy .inp files: SiC/SI5_C1h SiC/SI5_80K SiC/SI5_100K | last update: Takashi Fukushima
- 6. Appl. Phys. Lett. 87, 172108 (2005) , “Production of native donors in ZnO by annealing at high temperature in Zn vapor”, L. E. Halliburton, N. C. Giles, N. Y. Garces, Ming Luo, Chunchuan Xu, Lihai Bai, L. A. BoatnerZinc oxide crystals grown by the seeded chemical vapor transport method have been annealed in zinc vapor at 1100 °C for 30 min. These thermochemical reduction treatments produce a deep red coloration in the crystals and increase their n-type electrical conductivity. Electron paramagnetic... (Read more)
- 7. J. Quant. Spectrosc. Radiat. Transfer 90, 97-113 (2005) , “Spectroscopic investigations on ZnF2–MO–TeO2 (MO=ZnO, CdO and PbO) glasses doped with chromium ions”, C. Laxmi Kanth, B. V. Raghavaiah, B. Appa Rao , N. VeeraiahDifferential scanning calorimetric studies, spectroscopic studies (viz., optical absorption, ESR, infrared spectra) and thermoluminescence studies of ZnF2–MO–TeO2 (MO=ZnO, CdO and PbO) glasses doped with different concentrations of chromium ions have been investigated. Results have... (Read more)
- 8. Mater. Sci. Eng. C 25, 614-617 (2005) , “Incorporation of cobalt into ZnO nanoclusters”, Igor Ozerov, Françoise Chabre and Wladimir MarineThe structural, optical and magnetic properties of nanostructured ZnO films co-doped with cobalt and aluminium have been studied. The nanocrystalline films, with cluster sizes in range 50–100 nm, were deposited by pulsed laser ablation in a mixed atmosphere of oxygen and helium. The... (Read more)
- 9. Phys. Rev. B 71, 193202 (2005) , “EPR and theoretical studies of negatively charged carbon vacancy in 4H-SiC”, T. Umeda, Y. Ishitsuka, J. Isoya, N. T. Son, E. Janzén, N. Morishita, T. Ohshima, H. Itoh, A. GaliCarbon vacancies (VC) are typical intrinsic defects in silicon carbides (SiC) and so far have been observed only in the form of positively charged states in p-type or semi-insulating SiC. Here, we present electron-paramagnetic-resonance (EPR) and photoinduced EPR (photo-EPR)... (Read more)
- 10. Spectrochim. Acta A. 61, 2595-2602 (2005) , “VO2+ ions in zinc lead borate glasses studied by EPR and optical absorption techniques”, P. Giri Prakash , J. Lakshmana RaoElectron paramagnetic resonance (EPR) and optical absorption spectra of vanadyl ions in zinc lead borate (ZnO–PbO–B2O3) glass system have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of VO2+ ions. The values of spin-Hamiltonian parameters... (Read more)
- 11. Phys. Rev. B 69, 115210 (2004) , “Optical and magnetic properties of Mn in bulk GaN”, A. Wolos, M. Palczewska, M. Zajac, J. Gosk, M. Kaminska, A. Twardowski, M. Bockowski, I. Grzegory, S. PorowskiWe report results of electron paramagnetic resonance, magnetization, and optical absorption studies of bulk GaN crystals doped with Mn and, for some samples, codoped with Mg acceptor. The experiments performed show that the charge state of the Mn ion in GaN depends on the Fermi level position in the... (Read more)
- 12. J. Appl. Phys. 93, 9697-9702 (2003) , “Growth and characterization of GaN:Mn epitaxial films”, T. Graf, M. Gjukic, M. Hermann, M. S. Brandt, M. Stutzmann, L. Görgens, J. B. Philipp, O. AmbacherThe oxidation states of Mn in epitaxial GaN films grown by plasma induced molecular beam epitaxy were investigated by electron spin resonance (ESR), elastic recoil detection, superconducting quantum interference device magnetization, and photothermal deflection spectroscopy measurements. Comparison... (Read more)
- 13. J. Phys. Chem. Solids 64, 1027-1035 (2003) , “Optical absorption and fluorescence properties of Er3+ ion in MO–WO3–P2O5 glasses”, P. Subbalakshmi , N. VeeraiahTungsten phosphate glasses mixed with the three different modifier oxides, viz. PbO, ZnO and CaO doped with Er2O3 were prepared. The glasses were characterised by X-ray diffraction spectra, electron microscopy and differential thermal analysis. Optical absorption and photoluminescence spectra of... (Read more)
- 14. Micro. Eng. 66, 59-64 (2003) , “Magnetic resonance studies on ZnO nanocrystals”, H. Zhou, A. Hofstaetter, D. M. Hofmann and B. K. MeyerZnO nanocrystals with diameters ranging from 4 to 50 nm were prepared via a wet chemical method and post-growth annealing treatments. The electron paramagnetic resonance (EPR) spectra of the nanocrystals show the resonance of electron centers with g-value close to that of the shallow donors in bulk... (Read more)
- 15. Physica B 340-342, 15-24 (2003) , “Defects in SiC”, E. Janzén, I. G. Ivanov, N. T. Son, B. Magnusson, Z. Zolnai, A. Henry, J. P. Bergman, L. Storasta, F. CarlssonRecent results from studies of shallow donors, pseudodonors, and deep level defects in SiC are presented. The selection rules for transitions between the electronic levels of shallow donors in 4H–SiC in the dipole approximation are derived and the ionization energy for the N donor at... (Read more)
- 16. Appl. Phys. Lett. 81, 3945 (2002) , “Photoexcitation-electron-paramagnetic-resonance studies of the carbon vacancy in 4H-SiC”, N. T. Son, B. Magnusson, and E. JanzénPhotoexcitation-electron-paramagnetic-resonance (photo-EPR) studies were performed on p-type 4H-SiC irradiated with 2.5 MeV electrons. At W-band frequencies (~95 GHz) different EPR spectra could be well separated, allowing a reliable determination of the ground state levels of the... (Read more)
- 17. Appl. Phys. Lett. 80, 410 (2002) , “The level position of a deep intrinsic defect in 4H-SiC studied by photoinduced electron paramagnetic resonance”, M. E. Zvanut and V. V. KonovalovPhotoinduced electron paramagnetic resonance studies performed on nominally semi-insulating, high purity 4H-SiC have revealed charge transfer from an intrinsic defect (ID) to both the shallow boron acceptor and nitrogen donor. At 4 K, incident photon energy between 1.0 and 1.7 eV produces an... (Read more)
- 18. Appl. Phys. Lett. 80, 1334 (2002) , “Production of nitrogen acceptors in ZnO by thermal annealing”, N. Y. Garces, N. C. Giles, L. E. Halliburton, G. Cantwell, D. B. Eason, D. C. Reynolds, D. C. LookNitrogen acceptors are formed when undoped single crystals of zinc oxide (ZnO) grown by the chemical-vapor transport method are annealed in air or nitrogen atmosphere at temperatures between 600 and 900 °C. After an anneal, an induced near-edge absorption band causes the crystals to appear... (Read more)
- 19. Mater. Sci. Eng. 93, 39-48 (2002) , “Characterization of nitrides by electron paramagnetic resonance (EPR) and optically detected magnetic resonance (ODMR)”, E. R. Glaser, W. E. Carlos, G. C. B. Braga, J. A. Freitas, Jr , W. J. Moore, B. V. Shanabrook, A. E. Wickenden, D. D. Koleske, R. L. Henry, M. W. Bayerl, M. S. Brandt, H. Obloh, P. Kozodoy, S. P. DenBaars, U. K. Mishra, S. Nakamura, E. Haus, J. S. Speck, J. E. Van Nostrand, M. A. Sanchez, E. Calleja, A. J. Ptak, T. H. Myers and R. J. MolnarWe will highlight our recent work on the properties of residual defects and dopants in GaN heteroepitaxial layers and on the nature of recombination from InGaN single quantum well (SQW) light emitting diodes (LEDs) through magnetic resonance techniques. Electron paramagnetic resonance (EPR) and... (Read more)
- 20. Mater. Sci. Eng. A 332, 356-361 (2002) , “The preparation and characterization of ZnO ultrafine particles”, Liqiang Jing, Zili Xu, Jing Shang, Xiaojun Sun, Weimin Cai and Haichen GuoIn this paper, ZnO ultrafine particles (UFPs) were prepared by the thermal decomposition method of the precursor, zinc carbonate hydroxide. The structure and properties of the as-prepared ZnO UFPs were studied using TEM, XRD, BET, SPS, ESR, Raman, XPS and UV–Vis absorption spectroscopy. It... (Read more)
- 21. Phys. Rev. B 66, 235202 (2002) , “Continuous-wave and pulsed EPR study of the negatively charged silicon vacancy with S=3/2 and C3v symmetry in n-type 4H-SiC”, N. Mizuochi, S. Yamasaki, H. Takizawa, N. Morishita, T. Ohshima, H. Itoh, J. IsoyaThe TV2a center, which was suggested to be the excited triplet state (S=1) of the neutral silicon vacancy related defect [Sörman et al., Phys. Rev. B 61, 2613 (2000)] in the electron-irradiated n-type 4H-SiC has been studied by continuous wave and pulsed electron paramagnetic resonance... (Read more)
- 22. Appl. Surf. Sci. 180, 308-314 (2001) , “The surface properties and photocatalytic activities of ZnO ultrafine particles”, Liqiang Jing, Zili Xu, Xiaojun Sun, Jing Shang and Weimin CaiWe prepared ZnO ultrafine particles (UFPs) by thermal decomposition of the precursor zinc carbonate hydroxide. The surface properties of the as-prepared particles were studied using TEM, XRD, BET, SPS, EPR, IR, and XPS. The surface contains active species such as oxygen deficiencies and hydroxyl... (Read more)
- 23. Mater. Sci. Eng. R 33, 135-207 (2001) , “Comprehensive characterization of hydride VPE grown GaN layers and templates”, H. MorkoçGaN community has recently recognized that it is imperative that the extended, and point defects in GaN and related materials, and the mechanisms for their formation are understood. This is a first and an important step, which must be followed by defect reduction before full implementation of this... (Read more)
- 24. Phys. Rev. B 64, 245212 (2001) , “Structure of the silicon vacancy in 6H-SiC after annealing identified as the carbon vacancy-carbon antisite pair”, Th. Lingner, S. Greulich-Weber, J.-M. Spaeth, U. Gerstmann, E. Rauls, Z. Hajnal, Th. Frauenheim, H. OverhofWe investigated radiation-induced defects in neutron-irradiated and subsequently annealed 6H-silicon carbide (SiC) with electron paramagnetic resonance (EPR), the magnetic circular dichroism of the absorption (MCDA), and MCDA-detected EPR (MCDA-EPR). In samples annealed beyond the annealing... (Read more)
- 25. Phys. Rev. B 64, 235202 (2001) , “Photosensitive electron paramagnetic resonance spectra in semi-insulating 4H SiC crystals”, E. N. Kalabukhova, S. N. Lukin, A. Saxler, W. C. Mitchel, S. R. Smith, J. S. Solomon, A. O. EvwarayePhotosensitive electron paramagnetic resonance (EPR) investigations of unintentionally doped, semi-insulating (s.i.) 4H–SiC have been made at 37 GHz and 77 K including photoexcitation and photoquenching experiments. In the dark the EPR spectrum consists of a low intensity line due to boron on the... (Read more)
- 26. Phys. Rev. B 63, 233202 (2001) , “Tetrahedral Mni4 Cluster in Silicon”, J. Wedekind, H. Vollmer, R. Labusch.Mni40 clusters were investigated by electron paramagnetic resonance in silicon specimens with initial doping concentrations between 1.5×1015?P cm-3 and 5×1016?B cm-3. In n-type samples and in intrinsic samples, we obtained the EPR... (Read more)
- 27. Phys. Rev. B 61, 1918 (2000) , “EPR investigation of manganese clusters in silicon”, J. Martin, J. Wedekind, H. Vollmer, and R. LabuschManganese centers were investigated in silicon specimens with initial doping concentrations between 1.5×1015 P cm-3 and 6×1015 B cm-3. All known Mn centers could be observed but the cluster Mni3Mni was missing in highly-boron-doped... (Read more)
- 28. 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)
- 29. J. Non-Cryst. Solids 239, 16-48 (1998) , “Optically active oxygen-deficiency-related centers in amorphous silicon dioxide”, Linards SkujaThe spectroscopic properties, structure and interconversions of optically active oxygen-deficiency-related point defects in vitreous silica are reviewed. These defects, the E′-centers (oxygen vacancies with a trapped hole or 3-fold-coordinated silicons), different variants of diamagnetic... (Read more)GeO2 SiO2| EPR PL gamma-irradiation optical-spectroscopy| 0.5-1.0eV 1.0eV~ 1H 2.0eV~ 3.0eV~ 4.0eV~ 5.0eV~(larger) Chlorine E' E'-alpha E'-betha E'-delta E'-gamma Germanium H(I) H(II) Hydrogen ODC ODC(I) ODC(II) OHC Oxygen POR Silicon amorphous dangling-bond dielectric interstitial pair(=2) surface triplet vacancy | last update: Takahide Umeda
- 30. Nucl. Instrum. Methods Phys. Res. B 141, 566-574 (1998) , “Defect formation in amorphous SiO2 by ion implantation: Electronic excitation effects and chemical effects”, H. Hosono, N. MatsunamiIntrinsic defect formation in amorphous (a-) SiO2 by ion implantation was examined with emphasis upon electronic excitation effects and chemical reaction effects. 10 MeV proton beam and boron beam irradiated silica platelets to examine electronic excitation effects and chemical reaction effects. In... (Read more)
- 31. Phys. Rev. Lett. 80, 317-320 (1998) , “Experimental Evidence for Frenkel Defect Formation in Amorphous SiO2 by Electronic Excitation”, H. Hosono, H. Kawazoe, N. MatsunamiConcentrations of defects in amorphous SiO2 created by implantation of 10 MeV protons were examined. The depth profile of Si-Si bonds, E? centers, or peroxy radicals (PORs) was close to that of electronic energy loss. Interstitial O2 molecules were identified and... (Read more)
- 32. phys. stat. sol. (a) 162, 95-151 (1997) , “EPR and ENDOR Investigations of Shallow Impurities in SiC Polytypes”, S. Greulich-WeberInvestigations of nitrogen donors in 6H-, 4H- and 3C-SiC using conventional electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR) and optical detection of EPR and ENDOR as well as optical absorption and emission spectroscopy are reviewed and critically discussed. An... (Read more)
- 33. Appl. Phys. Lett. 68, 403 (1996) , “Correlation between photoluminescence and oxygen vacancies in ZnO phosphors”, K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, and J. A. VoigtBy combining electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy, a strong correlation is observed between the green 510 nm emission, the free-carrier concentration, and the density of singly ionized oxygen vacancies in commercial ZnO phosphor powders.... (Read more)
- 34. J. Appl. Phys. 79, 7983-7990 (1996) , “Mechanisms behind green photoluminescence in ZnO phosphor powders”, K. Vanheusden, W. L. Warren, C. H. Seager, D. R. Tallant, J. A. Voigt, B. E. GnadeWe explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen-vacancy density in commercial ZnO phosphors by combining photoluminescence, optical-absorption, and electron-paramagnetic-resonance spectroscopies. We find that the green... (Read more)
- 35. Radiat. Meas. 26, 131-137 (1996) , “Effect of oxide additives on radiolytic decomposition of zirconium and thorium nitrates”, N. G. Joshi, A. N. Garg, V. Natarajan and M. D. SastryGamma ray-induced decomposition of the binary mixtures of zirconium and thorium nitrates with 2.5, 5 and 10 mol% of V2O5, PbO, ThO2, ZrO2, and MnO2 has been studied at different doses up to 260 kGy. Radiation chemical yield G(NO2−)-values are enhanced by V2O5, PbO, and ThO2 but are decreased... (Read more)
- 36. Appl. Phys. Lett. 67, 1280 (1995) , “Impact of Pb doping on the optical and electronic properties of ZnO powders”, K. Vanheusden, W. L. Warren, J. A. Voigt, C. H. Seager, and D. R. TallantElectron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy have been combined to characterize Pb-doped ZnO ceramic powders. We observe a decrease in the 2.26 eV emission peak and a concomitant smearing of the band edges, narrowing the effective gap of the... (Read more)
- 37. J. Non-Cryst. Solids 179, 39-50 (1994) , “Paramagnetic resonance of E′-type centers in Si-implanted amorphous SiO2. Si29 hyperfine structure and characteristics of Zeeman resonances*1”, H. Hosono, H. Kawazoe, K. Oyoshi, S. TanakaElectron paramagnetic resonance spectra were measured on SiO2 glasses implanted with Si ions to a fluence of 6 × 1016 cm−2 at an acceleration voltage of 160 kV. Three sets of doublets with different separation were observed in Si29-implanted substrates and were ascribed to primary... (Read more)
- 38. J. Non-Cryst. Solids 116, 289-292 (1990) , “Bleaching of peroxy radical in SiO2 glass with 5 eV light*1”, H. Hosono, R. A. WeeksPeroxy radical (POR) in SiO2 glass has been found to be bleached out by illumination with 5 eV light without accompanying changes in E′ and non-bridging oxygen hole centers. An absorption band centered at 4.8 eV (FWHM; ≈ 0.8 eV is also bleached together with POR. It is suggested that... (Read more)
- 39. J. Non-Cryst. Solids 34, 339-356 (1979) , “ESR and optical absorption of cupric ion in borate glasses”, H. Hosono, H. Kawazoe and T. KanazawaESR and optical absorption of Cu2+ were measured in xNa2O(100−x)B2O3 (1 ≤ x ≤ 75), x ZnO(100−x)B2O3 (46 ≤ x ≤ 64) and x Pb(100−x)b2O3 (20 ≤ x ≤ 75) glasses, where x is expressed in mol.%. Spin hamiltonian parameters and ligand field... (Read more)
- 40. phys. stat. sol. (a) 55, 251 (1979) , “Photo-EPR of Dislocations in Silicon”, R. Erdmann, H. Alexander.The dependence of the EPR spectrum of dislocations in deformed silicon on illumination with monochromatic light reveals the two EPR centers Si - K1 (S < 1/2) to be different ionization states of one and the same dislocation center. The energy level separating these ionization states lies near the... (Read more)
- 41. Z. Physik B 23, 171-181 (1976) , “Intrinsic Defects in Electron Irradiated Zinc Oxide”, B. Schallenberge, A. Hausmann
- 42. Solid State Commun. 15, 1475-1479 (1974) , “Optical and paramagnetic properties of ZnO-Crystals simultaneously doped with copper and hydrogen”, E. Mollwo, G. Müller and D. ZwingelIn ZnO crystals, containing both Cu and H(D), we observe characteristic absorption peaks in the near i.r. and three new EPR signals. We explain these results by the formation of impurity complexes consisting of an OH center and one or two Cu ions. (Read more)
- 43. Solid State Commun. 14, 45-49 (1974) , “Paramagnetic and optical properties of Na-doped ZnO single crystals”, D. Zwingel and F. GärtnerESR-spectra of Na-doped ZnO single crystals are reported, caused by a hole trapped at the Na+ center. The isotropic part of the HFS is positive. An emission, due to recombination at the center, is reported, polarized c and peaked at 570 nm. The influence of covalent bonding is discussed. (Read more)
- 44. J. Lumin. 5, 385-405 (1972) , “Trapping and recombination processes in the thermoluminescence of Li-doped ZnO single crystals*1”, D. ZwingelThe thermoluminescence of Li-doped ZnO single crystals is investigated in the temperature range 4.2–300 K. A glow curve is observed with three maxima, two of them emitting the strong polarized yellow luminescence of ZnO. By varying the Li concentration in the range 0.1–200 ppm a change... (Read more)
- 45. J. Vac. Sci. Technol. 9, 87-90 (1972) , “Properties of ZnO Films Prepared by dc and rf Diode Sputtering”, J. VuillodA brief description of the dc and rf diode sputtering unit is first presented. The study of properties of the films is reviewed taking into consideration two main parameters, oxygen partial pressure and substrate temperature. Reflection electron diffraction and x-ray diffraction studies show that... (Read more)
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