Abstract
The formation of radiation defects in calcium and strontium fluoride single crystals doped withcadmium or zinc has been investigated by luminescence and absorption spectroscopy, as well asby electron spin resonance spectroscopy. It was found that x-irradiation could convert divalentimpurity ions located at essentially cubic sites into the univalent state. Three types ofCd+ orZn+ centers differing by local environment with point symmetriesOh,C3v and C2v are identified in the crystals. The formation of the last two results from the interactionbetween reduced impurities in the cubic environment and anion vacancies. The latter areintrinsic radiation defects and are not created by x-irradiation in undoped crystals. We alsodiscuss the possible implications of the electric field of the charge impurity defects onseparation of the intrinsic radiation defects in these crystals.
Published Version
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