PAT applications to primary radiolysis processes

From the correlations depicted in Sec. 4.1, information is also obtained on hole scavenging, temperature effects, e solvation, etc. Among many other applications of PAT in fast radiolysis, the aggregation of alcohol molecules in an alkane and the solvation of e in such a system is notheworthy. The ethanol molecules remain dispersed in the alkane at low alcohol concentration (C), as reflected by the small change in I3. With increasing C, the alcohol molecules aggregate and trap the electrons which can then solvate I3 decreases very rapidly. The variations of I3 also parallel those of the electron yield [120, 121]. 

In contrast with a previous claim [122], no clear correlation has been found recently between the Ps yields in liquids and either the e+ or e mobilities [27, 28]. 

By comparison with conventional pulse radiolysis techniques based on absorption spectra, PAT offer the advantage of not depending on the transparency of the medium. Thus, useful information on, e.g., quasi-free electron scavenging, can be obtained through PAT in non glassy solids or frozen solutions [14, 23, 123). 

Correlations can also exist between the processes governing Ps formation and those leading to the formation of excited fluorescent states these may arise from the recombination of cations and electrons produced by radiation at short times, in a similar way as Ps is formed [124], Valuable information is still to be obtained from such comparisons, which have remained scarce. 

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