Abstract
Recent experiments from several laboratories have determined the yield of cyclohexane fluorescence as a function of electron scavenger concentration. The results are not compatible with previous measurements of the yields of chemical product resulting from reaction of the electron with the scavenger in cyclohexane if the excited solvent state, RH ∗, is formed simply by the recombination of the electron and the alkane radical cation. We propose that interaction with an electron beam creates RH ∗+ . which on recombination with the electron does not form RH ∗. RH ∗+ . relaxes to form RH + . which does form RH ∗ on reaction with the electron. The mechanism was tested using published data on fluorescence quenching for the electron scavengers perfluorohexane (measured in two different laboratories) and perfluorodecalin, and good agreement was obtained.
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