Abstract
Guided ion beam mass spectrometry is used to examine the kinetic energy dependences of the reactions of ground-state atomic oxygen ion with molecular hydrogen and its isotopic variants. At interaction energies below 0.3 eV, the total reaction cross-sections for all three systems are in excellent agreement with those predicted by the Langevin-Gioumousis-Stevenson model for exothermic ion/molecule reactions. At energies above 0.3 eV, the reaction efficiency declines. Phase space theory calculations are used to show that this behavior is due partly to angular momentum constraints. Above 6 eV, dissociation of the product ion is evident. For reaction with HD, the intramolecular isotope branching ratio oscillates several times over the energy range examined. This result is explained by comparison with phase space theory calculations and with several dynamical models.
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