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- W2055683154 abstract "Abstract It is known since long that OH− and OD− defects form tunneling states with 〈1 0 0〉 symmetry in certain alkali halide crystals. Surprisingly, recent measurements of the dielectric susceptibility and of the infra-red absorption indicated that the tunnel splitting of the heavier isotope OD− is larger by a factor of 1.4 compared to that of OH−, although one would expect the opposite behavior from the difference in mass of hydrogen and deuterium. These surprising findings are yet only shown for those levels accessible in dielectric experiments. We have investigated NaCl:OD− by means of phonon spectroscopy with superconducting tunnel junctions in order to obtain additional information on the level scheme of OD− tunneling states in NaCl. Since the selection rules pertinent to dielectric measurements are different from those in elastic experiments, it becomes possible to study different transitions within the level scheme. Indeed, we find a resonance, which clearly can be attributed to OD− defects. A comparison with earlier measurements by Kinder and Windheim on OH− in NaCl leads to the conclusion that the anomalous isotope dependence is also found for the levels which are involved in phonon transitions, which confirms that the isotope effect is indeed connected with the tunnel splitting." @default.
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- W2055683154 date "2002-05-01" @default.
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- W2055683154 title "Phonon spectroscopy of tunneling states in NaCl:OD−" @default.
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- W2055683154 doi "https://doi.org/10.1016/s0921-4526(02)00533-1" @default.
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