Abstract
Abstract The isothermal luminescence (ITL) and the thermoluminescence of methylcyclohexane and 3-methylpentane glasses containing biphenyl have been studied after γ-radiolysis at 77 K. The ITL which follows radiolysis results from the neutralization of biphenyl cations. Only part of this ITL is easily bleached by IR light (λ>1 μm). The unbleachable portion results from the neutralization of biphenyl cations by biphenyl anions and represents a fraction of the total ITL very nearly equal to the fraction of the trapped negative charges which exist as biphenyl anions. Only a tunnelling mechanism can account for the anion-cation neutralization reaction under conditions excluding diffusion of molecular ions.
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