| Issue |
Europhys. Lett.
Volume 34, Number 1, April I 1996
|
|
|---|---|---|
| Page(s) | 63 - 68 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00416-x | |
| Published online | 01 September 2002 | |
Observation of high-frequency vibrational gap modes for KI:Cl- and KI:Br-
1
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
Received:
22
January
1996
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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