Abstract
This paper reports the absorption spectra of photochromic centers in CaF2 and SrF2 crystals doped with Ce3+ and Gd3+ impurities and thermal decay of the centers in temperature range 80-500 K. The ionized photochromic color centers are generated in crystals under low-temperature X-rays irradiation. These centers are transformed into photochromic color centers upon heating of crystals. All color centers decay at temperature about 500 K.
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