Ionic Process in γ-lrradiated 3-Methylpentane Glass Containing Triphenylamine

Abstract

Formation and decay process of ionic species in γ-irradiated 3-methylpentane glass con-taining a small amount of triphenylamine(TPA) were studied by esr, optical absorption and emission measurements at 77°K. Radical cations and radical anions of TPA and trapped electrons were produced inthe glass as ionic species.
In glass matrices, radical anions of TPA gave asinglet esr spectrum having a line width of 6 gauss, whereas cations of TPA gavea triplet esr spectrumhaving a hyperfine coupling constant of 14 gauss.
Decay rate of trapped electrons at 77°K obtained from the esr measurement was directly proportional to thatof radical cations obtained from the luminescence measurement, and both rates were not affected by the concentration of TPA. From the results, it was concluded that trapped electrons migrated in the glass at 77° K, and recombined with radical cations of TPA to form excited TPA molecules.