Abstract
Ion cyclotron resonance (ICR) techniques have been applied in a detailed study of ion-molecule reactions in hydrogen/rare-gas systems. Absolute rate constants are reported for both the total rate of reaction as well as for each of the possible reaction channels for reaction of H 2 + with X and X + with H 2, where X is either helium or neon. The average translational energy of the reactant ions is less than 0.1 eV, and thus these rate constants are indicative of reaction of ions whose translational energy may be considered as approximately thermal. The energy dependence of the total rate of reaction was measured using a new technique which is based on the ability to energize an ion in the source and observe ions of the same mass in the analyzer. Additionally, the rate constants for each reaction channel were measured using standard double-resonance methods. Isotope effects, as reflected in the product-ion ratio XH +/XD + of reaction products from the reaction of HD + with He and Ne, were also examined as a function of energy. The results are compared with theoretical predictions and with previous experimental studies.
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