Abstract
The impurity induced infrared absorption in CsCl and CsI is calculated and compared with experiment. The perfect crystal is described by a breathing shell model the density of states and the Green functions of the perfect crystal are calculated using 27000 points in the Brillouin zone. The impurities are described by models involving changed central and noncentral force constants between the defect and its nearest neighbours, and between the nearest neighbours themselves. Fitting the experimental data yields not only the parameters necessary to describe the defects but also suggests improved parameters for describing the perfect crystals.
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