The radiophoto-luminescence of gamma-irradiated hydrocarbon glasses at 77K

Abstract The radiophoto-luminescence (RPL) from γ-irradiated hydrocarbon glasses, i.e., 3-methylhexane, methylcyclohexane, and ethylcyclohexane, containing small amounts of various aromatics (1,3,5-trimethylbenzene, biphenyl, naphthalene, and 1,4-diazine) is investigated at 77 K by infrared-light irradiation. The spectra of the R PL consist of the fluorescence and phosphorescence of the guest aromatic molecule, and the ratio of the phosphorescence to the fluorescence intensity is larger than that in the photoexcitation, indicating the existence of another path to the triplet state. The RPL is quenched by the addition of N2O, but it is not much affected by that of NH3. A possible mechanism for the RPL is considered, and its analysis is given.