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The isothermal decay of luminescence emitted in frozen hydrocarbons as a result of the recombination of trapped electrons with aromatic solute cations has been studied in relation to theoretical models for the primary processes of radiolysis. The kinetics were determined on a time scale extending from -20 to 800 ns, with radiations of different LET.In polar liquids the influence of physical as well as chemical properties of the solvent on the yield G(e,,,) at a given time ( t = 3 ns) has been investigated: in particular, evidence was found of the existence of a correlation between the survival probability of eGlv and the efficiency factor of the eS;,,-cation recombination, which had so far been assumed to be limited only by diffusion.* bPBD = 2-(4-butylphenyl) 5-(4-biphenylyl)l,3,4-oxadiazole. PTP = p-terphenyl.

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