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Determination of color centers in CaF2 crystals by multiple gamma-ray irradiationsDOI: 10.1007/s11434-012-5615-z Keywords: CaF2,TGT,gamma-ray,irradiation,color centers,crystals Abstract: Color centers of CaF2 crystals subjected to three high-dose gamma-ray irradiation treatments were studied. Three absorption bands at 349, 409 and 478 nm are ascribed to the F interstitials through the variation in difference additional absorption values. The transformation of interstitial F atoms to F ions (Fi ) is demonstrated using data with increasing radiation dose. The decrease in the 600 nm absorption band and the occurrence of the 580 nm band correspond to F2 + center conversion to F center. The complex (F -Fi 0) might be associated with the 962 and 1196 nm bands.
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