The Spatial Dispersion Effects in CdS Crystals and Their Temperature Dependence

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Abstract
The dispersion of the refractive index of a CdS crystal in the region of its main exciton bands is experimentally investigated at temperatures ranging from 4 to 80 °K. From the change of the birefringence pattern in the region of the lowest state, three specific temperature intervals are revealed. The data obtained show good agreement with the predicted temperature change of the normal wave parameters for media with the spatial dispersion; 1) in the low‐temperature region (T < 15 °K) in different regions of the absorption band either one or the second normal wave is dominating: 2) in the region of intermediate temperatures including the “critical” temperature T0 predicted by the theory (25 to 55 °K), both waves being comparable in intensity within the absorption band halfwidth; 3) in the high‐temperature region (T > 55 °K) one wave dominates all along with the dispersion of the classical character.

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