Abstract
Using infrared and optical absorption spectroscopy in combination with photoconductivity measurements on uranium-doped calcium fluorite crystals, we clarify a controversy in the assignment of U 2+ and U 4+ ion valences in CaF 2 crystals which exhibit different coloration. The energy thresholds of donor-like processes (photoionization) follow the sequence of ionization potentials for uranium ions of different valences and indicate the green and yellow colors to be due to U 4+ of different charge compensation.
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