Theoretical and experimental studies of the second-order Raman spectra of CsCl, CsBr, and CsI

Authors

B.S. Agrawal, University of Nebraska-Lincoln
Roger D. Kirby, University of Nebraska-LincolnFollow
John R. Hardy, University of Nebraska-LincolnFollow

Date of this Version

March 1974

Comments

Published Phys. Rev. B 11, 5153 (1975). Permission to use.

Abstract

Measurements of the second-order Raman spectra of CsCl, CsBr, and CsI have been made at both 300 and 80 °K. From these the three independent spectral components, A 1g, E g, and T 2g, have been determined for all three crystals at both temperatures. A theoretical interpretation of these data has been carried out using the phenomenological Born-Bradburn model to describe the Raman polarizability tensor and the deformation-dipole model to provide the lattice-dynamical eigendata. We have found it possible to obtain an excellent description of the observed spectra retaining 16 of the first- and second-neighbor polarizability derivatives in the Born-Bradburn expressions for the elements of the polarizability tensor. We have also found that only three of these need be retained to obtain a good semiquantitative fit to the observed spectra.