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The X-ray coloration of KI, in particular the growth of the F band, has been investigated at a series of temperatures below room temperature. It is found that the slow stage rate of growth of the F band, and the qualitative features of the absorption spectra of irradiated crystals, are sample dependent even at liquid helium temperature. The rate of growth of the F band is found to be very temperature dependent, showing a very rapid rise near 90 °K and reaching a maximum between 90 and 195 °K. This is explained in terms of a model based on the interaction of pairs of singly ionized anions.
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Hall et al. (1964) studied this question.
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