Product formation in ion–ion recombination reactions involving the molecular anions of SF6 and perfluoromethylcyclohexane

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Abstract
Experiments are described in which resonance electron attachment reactions A+e→A−, where A is SF6 or perfluoromethylcyclohexane (C7F14), are made to occur under conditions in which the observed depletion of A is affected not only by the electron attachment reaction, but also by the detailed nature of the subsequent recombination of the molecular anions with positive ions, p++A−→neutrals. It will be shown that the composite rate coefficients thereby measured, along with knowledge of the electron attachment coefficients, allow the efficiencies of molecular regeneration by ion–ion recombination, p++A−→A+neutrals, to be determined for A−=SF−6 and C7F−14. It is shown that SF−6 is converted by recombination primarily to unknown neutral species which do not undergo further electron attachment. It is also shown that C7F−14 is converted by recombination primarily back to the molecular species, C7F14.