Evidence is presented supporting the hypothesis that a small but finite yield of O atoms results upon <tex-math>$[{}^{60}{\rm Co}]\gamma \text{-ray}$</tex-math> irradiation of liquid water. Ethylene, a specific product of the O + cyclopentene (CP) reaction, forms in irradiated aqueous CP solutions with a yield, <tex-math>$G({\rm C}_{2}{\rm H}_{4})$</tex-math> of 0.0023. <tex-math>$G({\rm C}_{2}{\rm H}_{4})$</tex-math> increases 12-fold in irradiated 4 M NaClO4, a known source of aqueous O atoms. And verifying that the O atoms from H2 O and the <tex-math>${\rm ClO}_{4}{}^{-}$</tex-math> are the same, 0.3 M CH3 OH lowers <tex-math>$G({\rm C}_{2}{\rm H}_{4})$</tex-math> by the same fractional amount in the presence and absence of 4 M NaClO4.

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