Volume 34, Number 1, April I 1996
|Page(s)||63 - 68|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Observation of high-frequency vibrational gap modes for KI:Cl- and KI:Br-
Laboratory of Atomic and Solid State Physics and
Materials Science Center,
Cornell University - Ithaca, NY 14853, USA
2 J. J. Thomson Physical Laboratory, University of Reading, Whiteknight, Box 220, Reading RG6 6AF, UK
3 Universität Regensburg, Institut für Theoretische Physik - 93053 Regensburg, Germany
Accepted: 12 February 1996
Strong far-IR impurity-induced gap modes are observed just below the bottom of the optic phonon band in KI: one for and the other for . Both of these modes have been predicted using empirical potentials. The agreement between theory and experiment for the two modes indicates that the impurity displacement is dominant for the higher-frequency one but of little importance for the lower-frequency pocket-like gap mode.
PACS: 78.30.-j – Infrared and Raman spectra and scattering / 63.20.Pw – Localized modes / 78.50.-w – Impurity and defect absorption in solids
© EDP Sciences, 1996
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