Digitale Medien
Springer
International journal of infrared and millimeter waves
3 (1982), S. 743-751
ISSN:
1572-9559
Schlagwort(e):
alkali halide
;
defect modes
;
impurities in insulators
;
far-infrared spectroscopy
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The far-infrared reflectivity spectra of KI doped with 1% Cl− and 2% Na+ were measured using a dual cavity technique. In addition to the observation of all previously-observed resonant and gap modes, several features were discovered in and near the optic band. A new gap mode at 90 cm−1 in KI:Cl− was discovered. In both systems sharp, narrow reductions in reflectivity at 98, 108, 116, and 139 cm−1 were observed, as was a general reduction in reflectivity between 108 and 139 cm−1. The structure at 98 and 116 cm−1 is most-likely due to optical activity induced in normally inactive lattice modes by the high concentration of impurities. The features at 108 and 139 cm−1 and the reduction in reflectivity between them were shown by a simple model calculation to be due to an increase in damping of the TO phonon.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01009732
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