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- 1. Phys. Rev. Lett. 102, 075506 (2009) , “Proton Tunneling: A Decay Channel of the O-H Stretch Mode in KTaO3”, E. J. Spahr, L. Wen, M. Stavola, L. A. Boatner, L. C. Feldman, N. H. Tolk, and G. LüpkeThe vibrational lifetimes of the O-H and O-D stretch modes in the perovskite oxide KTaO3 are measured by pump-probe infrared spectroscopy. Both stretch modes are exceptionally long lived and exhibit a large “reverse” isotope effect, due to a phonon-assisted proton-tunneling process, which involves the O-Ta-O bending motion. The excited-state tunneling rate is found to be 7 orders of magnitude larger than from the ground state in the proton conducting oxide, BaCeO3 [Phys. Rev. B 60, R3713 (1999)]. (Read more)
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Updated at 2010-07-20 16:50:39
Updated at 2010-07-20 16:50:39
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