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The principal absorption bands induced by irradiation at liquid-helium temperature with x rays in CsBr crystals are the complex F band and two overlapping V bands at 435 and 497 m{μ}. In view of the dichroic properties of these V bands, the most obvious model seems to be a Br₂^- molecule-ion lying in the $〈100〉$ directions. The two observed absorption bands would be due to two transitions in the same center. Regarding the bleaching properties, the F center cannot be the only color center responsible for the structure of the complex absorption band. Hypotheses are proposed about the interactions between the V and F centers.
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Wiele et al. (1965) studied this question.
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