Color centers induced in lif crystals by low temperature electron irradiation

Avtorlar

  • I Nuritdinov

    Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan

  • M.A Mussaeva

    Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan

  • E.M Ibragimova

    Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan

  • Z.U Esanov

    Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan

  • K.K Nurimbetov

    Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan

  • B.T Atashov

    Nukus State Pedagogical Institute named after Ajiniyaz image/svg+xml

Gilt sózler: lithium fluoride (LiF), electron irradiation, color centers, Li nanocolloids

Annotaciya

The absorption spectra of optical pure LiF crystals were studied after irradiation with 5 MeV electrons at a beam current 400 nA to fluencies 5∙1014 cm-2 and 1015 cm-2 at ~165 K and ~288 K, which are below and above the tem- perature of charge carrier release from traps. Immediately after such irradiation, the crystals acquired a bright green colora- tion, which was stable at 77 K and annealed at 300 K. The absorption spectra contain the known bands of F-centers at 250 nm and F (M)-centers at 445 nm with their intensity ratio depending on the irradiation temperature. At a higher irradiation dose of 1015 cm-2, even at 165 K, which hinders thermal diffusion, the increase in the concentration of F centers is suffi- cient to form larger aggregates of vacancies responsible for M centers of 440 nm and growing absorption bands at 320, 380 nm, as well as Li nanocolloids (~520, 600, 950 nm).

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