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- W2091215395 abstract "Measurements of the far-infrared isotope-induced one-phonon absorption in single-crystal natural lithium fluoride at approximately 10 ifmmode^circelsetextdegreefi{}K are reported. The main feature observed shows a decrease in the frequency of the [100] transverse acoustic (TA) branch at ${X}_{5}^{ensuremath{'}}$ of (2-3)% compared with the room-temperature value measured by inelastic neutron scattering. The measured absorption constant agrees poorly with that predicted using the modified deformation-dipole data of Karo and Hardy, but agrees very well with that predicted by the shell model fitted to the measured dispersion curves. An intensity discrepancy, as the feature due to ${X}_{5}^{ensuremath{'}}$ is approached, indicates an error, however, in the shell-model lithium-ion eigenvectors along the [100] TA direction of up to (15ifmmodepmelsetextpmfi{}5)%. The shell-model data have also been used to calculate the contribution of the isotope-induced one-phonon processes to the measured conductivity above the reststrahlen frequency. It is seen that this contribution may explain some of the minor features observed in that region." @default.
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- W2091215395 date "1972-10-15" @default.
- W2091215395 modified "2023-10-18" @default.
- W2091215395 title "Measurement and Analysis of the Isotope-Induced One-Phonon Infrared Absorption in LiF" @default.
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- W2091215395 doi "https://doi.org/10.1103/physrevb.6.3128" @default.
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