title: Radiation defects in CaF(2) and SrF(2) crystals doped with cadmium or zinc.
abstract: The formation of radiation defects in calcium and strontium fluoride single crystals doped with cadmium or zinc has been investigated by luminescence and absorption spectroscopy, as well as by electron spin resonance spectroscopy. It was found that x-irradiation could convert divalent impurity ions located at essentially cubic sites into the univalent state. Three types of Cd(+) or Zn(+) centers differing by local environment with point symmetries O(h), C(3v) and C(2v) are identified in the crystals. The formation of the last two results from the interaction between reduced impurities in the cubic environment and anion vacancies. The latter are intrinsic radiation defects and are not created by x-irradiation in undoped crystals. We also discuss the possible implications of the electric field of the charge impurity defects on separation of the intrinsic radiation defects in these crystals.
authors.affiliation: Vinogradov Institute of Geochemistry, Russian Academy of Sciences, Favorskii street 1a, PO Box 4019, 664033 Irkutsk, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Egranov
authors.forename: E A
authors.initials: EA
authors.lastname: Radzhabov
authors.forename: V F
authors.initials: VF
authors.lastname: Ivashechkin
authors.forename: M A
authors.initials: MA
authors.lastname: Semenova
authors.forename: I E
authors.initials: IE
authors.lastname: Vasil'eva