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The influence of selective light irradiation on the absorption behaviour of additively coloured CaF 2 crystals at 84, 300, and 500 °K is investigated. It was found that reversible photochromic reactions occur especially at 500 °K. Irradiation into the F band gives rise to an absorption increase of the long‐wavelength absorption peaks. A complete reconversion is possible, so that the formation of colloids can be ruled out.
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Görlich et al. (1973) studied this question.
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