The far-infrared absorption spectra of some alkali halide alloys

A study has been made of the far-infrared transmission spectra of some K x Rb 1− x − Cl yBr 1− y alloys with ( x, y) ≈ 1 mole%. and the results are reported in this paper. An absorption band at 94.5cm −1 in KBr:Cl has been observed, in agreement with the results of other workers. New bands at 99 cm...

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Bibliographic Details
Published in:Infrared physics 1978-01, Vol.18 (5), p.915-918
Main Authors: Gledhill, G.A., Syms, M., Angress, J.F.
Format: Article
Language:English
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Summary:A study has been made of the far-infrared transmission spectra of some K x Rb 1− x − Cl yBr 1− y alloys with ( x, y) ≈ 1 mole%. and the results are reported in this paper. An absorption band at 94.5cm −1 in KBr:Cl has been observed, in agreement with the results of other workers. New bands at 99 cm −1 in KBr:Rb. 99 cm −1 in RbCl:K and 103 cm −1 in RbCl:Br have also been found. These bands are attributed to impurity-induced modes in the gaps in the frequency distributions of KBr and RbCl. Comparison of these results with the theoretical results of Mitani and Takeno indicates that the ‘force constants’ associated with Rb and Br impurities are enhanced relative to those associated with K and Cl impurities. The relationship between the results presented here and some features in the infrared reflection spectra of non-dilute alloys is discussed.
ISSN:0020-0891
DOI:10.1016/0020-0891(78)90124-0