Paramagnetic frenkel defects in irradiated alkali-haloid crystals |
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| Authors: | V V Akunets O N Bilan S A Mikhnov V F Stel’makh |
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| Institution: | (1) Belarusian State University, Minsk, Belarus;(2) Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus;(3) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., 220072 Minsk, Belarus |
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| Abstract: | In the EPR spectra of γ-irradiated NaF,6LiF, and LiF crystals with natural content of isotopes (independent of the impurity composition), the hyperfine structure
(HFS) is observed against the background of a broad band. Absorption saturation in the system of defects responsible for the
HFS and the broadband occurs at widely different power levels of microwave radiation, and broad band suppression takes place
at registration in quadrature. The experimentally measured intensity distribution and the number of EPR lines in the6LiF crystal correlate with the calculated data when the spin interaction of an unpaired electron with 14 equaivalent fluorine
nuclei is taken into account. A model of major radiation-induced paramagnetic defects in the form of Frenkel pairs, in which
one component (the negatively charged quasi-molecule consisting of two halogen atoms) can be responsible for the HFS and the
other component (F-center) for the broad band in the EPR spectrum, is proposed. |
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| Keywords: | hyperfine structure alkali-haloid crystal irradiation defect two-component nature EPR spectrum |
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