Measurements of the circular dichroism in the low-energy tail of the first exciton absorption peak in KI are presented and discussed. The magnitude of the observed dichroism allows the rms splitting of the P3/2-like hole to be evaluated. The result is that the cubic part of the Urbach perturbation is at least 15 times larger than the noncubic part.
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S. E. Schnatterly (1970) studied this question.
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