The formation and destruction of H3O-

Article abstract of DOI:10.1063/1.467136

We report the first measurements of rate constants for formation and reaction of the Ion Phys. 49, 311 (1983)>, namely, dehydrogenation of formaldehyde by hydroxide to form hydrated-hydride ion and carbon monoxide.The OD^- + H2CO reaction is about 35percent efficient at 298 K, with OD^-/OH^- exchange occurring in about half the reactions.H3O^- was observed to undergo thermal dissociation in a helium carrier gas at room temperature with a rate constant of 1.6 * 10^-12 cm³ s^-1.We also studied a new reaction in which H3O^- is formed: The association of OH^- with H2 in a He carrier gas at low temperatures.The rate coefficient for this ternary reaction is 1*10^-30 cm⁶ s^-1 at 88 K.Rate coefficients and product branching fractions were determined for H3O^- reactions with 19 neutral species at low temperatures (88-194 K) in an H2 carrier.The results of ion-beam studies, negative-ion photoelectron spectroscopy, and ion-molecule reaction data allow us to specify the hydride-water bond energy D⁰₂₉₈(H^- - H2O) = 14.4+/-1.0 kcal mol^-1 (0.62+/-0.04 eV).The heat of formation of H3O^-, -37.5+/-1.0 kcal mol^-1, and the proton affinity of H3O^-, 386.0+/-1.0 kcal mol^-1, are derived from these results.Dissociation of H3O^- into OH^- and H2 requires 4.5+/-1.0 kcal mol^-1 energy.

Full text of DOI:10.1063/1.467136

The formation and destruction of H3O−
Thomas M. Miller, A. A. Viggiano, Amy E. Stevens Miller, Robert A. Morris, Michael Henchman, John F.
Paulson, and Jane M. Van Doren
Citation: The Journal of Chemical Physics 100, 5706 (1994); doi: 10.1063/1.467136
View online: http://dx.doi.org/10.1063/1.467136
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/100/8?ver=pdfcov
Published by the AIP Publishing
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
138.237.77.209 On: Sat, 13 Dec 2014 16:53:19