Studies of the photoplastic behavior of CdS single crystals show that when slip occurs on the basal plane, a large increase in flow stress is observed in the presence of incident light. However, when the crystal is oriented for slip on the prismatic planes, a very small photoplastic effect is observed. Measurements of the current associated with dislocation motion on the active slip systems indicate that the photoplastic effect is proportional to the charge on the dislocations in the respective slip planes.
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Garosshen et al. (1990) studied this question.
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