Reaction of D3O+ with D2: Proton affinity of water

R. J. Cotter, W. S. Koski

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The cross section for the endothermic ion-molecule reaction: D3O +(D2D2O)D3O+ has been studied over the energy range 2-70 eV using a tandem mass spectrometer. The projectile beam was found to contain a significant fraction of the D 3O+ in an excited electronic state which was relatively insensitive to collisional deactivation using high pressures but was readily deactivated using the paramagnetic gas NO in the primary ion source. Threshold measurements, using the ground state D3O+ beam, permitted a determination of the proton affinity of water and the conclusion that the reaction proceeded through a persistent intermediate complex at energies close to the threshold.

Original languageEnglish (US)
Pages (from-to)784-787
Number of pages4
JournalThe Journal of Chemical Physics
StatePublished - 1973
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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