Ilim ha’m ja’miyet № 7-1 (2025) · Саҳифаҳои 19-21
COLOR CENTERS INDUCED IN LIF CRYSTALS BY LOW TEMPERATURE ELECTRON IRRADIATION
Nuritdinov, I., Mussaeva, M.A., Ibragimova, E.M., Esanov, Z.U., Nurimbetov, K.K., Atashov, B.T.
Аннотатсия
The absorption spectra of optical pure LiF crystals were studied after irradiation with 5 MeV electrons at a beam current 400 nA to fluencies 5·10^14 cm^-2 and 10^15 cm^-2 at ~165 K and ~288 K, which are below and above the temperature of charge carrier release from traps. Immediately after such irradiation, the crystals acquired a bright green coloration, 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 F2(M)-centers at 445 nm with their intensity ratio depending on the irradiation temperature. At a higher irradiation dose of 10^15 cm^-2, even at 165 K, which hinders thermal diffusion, the increase in the concentration of F2 centers is sufficient 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).
litiy ftorid (LiF)elektron nurlantirishrang markazlariLi nanokolloidlariфторид лития (LiF)электронное облучениецентры окраскинаноколлоиды Lilithium fluoride (LiF)electron irradiation
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