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Proton Affinity of Water

1972; American Institute of Physics; Volume: 56; Issue: 5 Linguagem: Inglês

10.1063/1.1677551

1520-9032

Shuang-Ling Chong, Ransom A. Myers, J. L. Franklin,

Mass Spectrometry Techniques and Applications

By employing elevated pressures in the ion source of a quadrupole mass filter, it is shown that D3S+ does not transfer a deuteron to D2O and that D3O+ transfers a deuteron to D2S. Studies were carried out in most instances under conditions where the reactant ion undergoes 30–60 collisions before reacting. Thus, most excess energy should have been removed. The transfer of deuteron from D3O+ to D2S appears to go to equilibrium with an equilibrium constant of 14.4 which corresponds to a heat of reaction of 1.8 kcal/mole. From this we deduce the proton affinity of water to be 168 kcal/mole.