Abstract
Product distribution and rate constants are obtained for the reactions of NH 3 + and NH 2 + ions with H 2O and for the reactions of OH +, H 2O +, and H 3O + ions with NH 3, by using tandem and trapped-ion ICR methods. A large fraction of NH 3 + ions are produced in vibrationally excited states by electron impact ionization above threshold, and these excited ions react by proton transfer to H 2O. This latter reaction is endothermic for ground-state NH 3 + ions, and slow hydrogen atom abstraction from H 2O is observed for reaction of NH 3 + ions with less than the required amount of excess internal energy. Proton and charge transfer dominate the reactions of OH + and H 2O + ions with NH 3, and proton transfer dominates the NH 2 +H 2O and H 3O +NH 3 reactions.
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