Thermo-and photoluminescence were studied on neat 2-methyltetrahydrofuran glass after γ-irradiation at 77°K in dark. When the glass was warmed, thermoluminescence was observed at about 97°K. Photoluminescence was also induced by light of λ>600 nm. The luminescence spectrum was structureless with a maximum at 460 nm, which coincides with the luminescence induced by stimulating free radicals with ultraviolet light (270~350 nm). Both the thermo-and photoluminescence are interpreted as due to the formation of an excited free radical by the charge recombination reaction, Lifetime measurements indicate that the free radical is probably excited to its fluorescent state.
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Ichikawa et al. (1972) studied this question.
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