The two phonon Raman spectra of alkali halide crystals
- 14 March 1972
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 5 (5) , 595-605
- https://doi.org/10.1088/0022-3719/5/5/011
Abstract
The two phonon Raman spectrum of KBr is calculated. The calculation is based on the shell model and assumes a nonlinear coupling between the shell and the core of the negative ions. It is found that the results are considerably improved by using a breathing shell model rather that a rigid shell model. The theory then contains three parameters which may be chosen to give a reasonable description of the experimental results. An investigation of the importance of inter-ionic nonlinearities suggests that they are far less important for describing Raman scattering than are the intra-ionic terms.Keywords
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