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Cannas, M; Agnello, S; Gelardi, F M; Boscaino, R; Trukhin, A N; Liblik, P; Lushchik, C; Kink, M F; Maksimov, Y; Kink, R A
Journal of physics. Condensed matter, 11/2004, Letnik: 16, Številka: 45Journal Article
Optical transitions associated with gamma-radiation-induced defects in crystalline alpha-quartz were investigated by photoluminescence excited by both pulsed synchrotron radiation and steady-state light. After a 10 MGy gamma-dose we observed two emissions at 4.9 eV (ultraviolet band) and 2.7 eV (blue band) excitable in the range of the induced absorption band at 7.6 eV. These two luminescence bands show a different temperature dependence: the ultraviolet band becomes bright below 80 K; the blue band increases below 180 K, but drops down below 80 K. Both emissions decay in a timescale of a few ns under pulsed excitation, however the blue band could also be observed in slow recombination processes and it afterglows in about 100 s at the end of steady-state excitation. The origin of the observed luminescence bands and the comparison with optical features of oxygen-deficient centres in silica glass are discussed in the framework of different models proposed in the literature.
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