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).
| Mualliflar | Nuritdinov, I., Mussaeva, M.A., Ibragimova, E.M., Esanov, Z.U., Nurimbetov, K.K., Atashov, B.T. |
|---|---|
| Jurnal | Ilim ha’m ja’miyet |
| Nashr sanasi | 2025-11-15 |
| Son | 7-1 |
| Betlar | 19-21 |
| Til | Ingliz |
litiy ftorid (LiF), elektron nurlantirish, rang markazlari, Li nanokolloidlari, фторид лития (LiF), электронное облучение, центры окраски, наноколлоиды Li, lithium fluoride (LiF), electron irradiation, color centers, Li nanocolloids
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