Abstract
Electrons and hydroperoxyl radicals are trapped in polycrystalline ice after irradiation of water vapor and rapid condensation to 77 °K. Using higher sample flow rates than in the earlier work of Seddon, Smith, and Bindner, the electron spin resonance spectra of the trapped electrons (et−) were obtained in both H2O and D2O ice with negligible interference from the underlying HO2• (DO2•) radicals. Addition of C(NO2)4, H2O2, (CH3)2SO, and O2 as radical scavengers confirmed the earlier prediction that reactions with the radicals do not occur in the vapor phase in this system. The results with C(NO2)4 and H2O2 also provided chemical evidence consistent with the spectroscopic assignment for HO2• (DO2•) radicals. Experiments with added isobutylene suggested that hydrogen atoms are formed (possibly in a post-irradiation reaction during condensation) and are also produced on photobleaching et− at 77 °K.
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