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Potassium chloride and bromide crystals have been irradiated with x-rays at -183^∘{}C and the behavior of the V₁, F, and F^' optical absorption bands observed during subsequent warming to room temperature. The thermal bleaching of the V₁-band is accompanied by a decrease in the F-band, the appearance of free charge within the crystal, and luminescence. The data indicate that positive holes are released from traps during this process.
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Dutton et al. (1953) studied this question.
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