Abstract
Magnetic field and magnetic isotope effects demonstrate the importance of spin correlation in geminate ion recombination in hydrocarbons. The role of these studies in identifying mechanisms and their extension to low temperatures are discussed. Calculations are presented which show that field effects may be observed by pulse radiolysis at times less than one nanosecond. In contrast, correlation effects on reactions of neutral radicals are speculative at present. The relatively low rate constant of hydrogen atom recombination may be due to spin limitations: if so, re-encounters should lead to field-dependent changes in the relative yields of ortho- and pyra-hydrogen from the non-geminate reaction. Reactions in spurs should lead to further effects but these are likely to be small.
Published Version
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