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- W202619818 abstract "Reactions of protonated water clusters, H(H2O)n+ (n=1–4) with D2O and their “mirror” reactions, D(D2O)n+ (n=1–4) with H2O, are studied using guided-ion beam mass spectrometry. Absolute reaction cross sections are determined as a function of collision energy from thermal energy to over 10 eV. At low collision energies, we observe reactions in which H2O and D2O molecules are interchanged and reactions where H-D exchange has occurred. As the collision energy is increased, the H-D exchange products decrease and the water exchange products become dominant. At high collision energies, processes in which one or more water molecules are lost from the reactant ions become important, with simple collision-induced dissociation processes, i.e., those without H-D exchange, being dominant. Threshold energies of endothermic channels are measured and used to determine binding energies of the proton bound complexes, which are consistent with those determined by thermal equilibrium measurements and previous collision-induced dissociation studies. A kinetic scheme that relies only on the ratio of isomerization and dissociation rate constants successfully accounts for the kinetic energy dependence observed in the branching ratios for H-D and water exchange products in all systems. Rice–Ramsperger–Kassel–Marcus theory and ab initio calculations confirm the feasibility and establish the details of this kinetic model." @default.
- W202619818 created "2016-06-24" @default.
- W202619818 creator A5012564920 @default.
- W202619818 creator A5030106958 @default.
- W202619818 date "2004-10-26" @default.
- W202619818 modified "2023-10-16" @default.
- W202619818 title "The mechanism of proton exchange: Guided ion beam studies of the reactions, H(H2O)n+ (n=1–4)+D2O and D(D2O)n+ (n=1–4)+H2O" @default.
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- W202619818 doi "https://doi.org/10.1063/1.1802391" @default.
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