Nascent product vibrational state distributions of ion-molecule reactions: The proton transfer reactions F- + HX -> HF(v) + X-, X = Cl, Br, and I

Article abstract of DOI:10.1063/1.441925

Nascent vibrational state distributions are obtained for the HF products of the proton transfer reactions F^- + HX -> HF(v) + X^-, X = Cl, Br, and I.The reactions are carried out in a flowing afterglow apparatus in which the reagents are fully thermalized (300 K).The product states are measured by low resolution infrared chemiluminescence spectra obtained with a Ge:Cu infrared detector and a circular variable filter.The nascent HF(v) distributions are as follows: for F^- + HCl, N₁:N₂:N₃ = 0.46:0.33:021; for F^- + HBr, N₁:N₂:N₃:N₄ = 0.28:0.27:0.24:0.21; for F^- + HI, N₁:N₂:N₃:N₄:N₅ = 0.20:0.23:0.22:0.20:015. All three reactions channel the available exothermicity quite efficiently into product vibration.Product rotational state information cannot be obtained due to collisions with the He carrier gas.In spite of the deep attractive wells of the F^- + HX potential energy surfaces, in all three cases the degree of vibrational excitation in the ion-molecule reaction is remarkably similar to, although distinctly smaller than, that of the corresponding neutral F + HX reactions.The results strongly suggest that these ion-molecule reactive collisions are direct encounters and that the kinematic effect of the mass combination (transfer of the light particle between two heavy particles) dominates over the influence of the shape of the potential energy surface in determining the product vibrational state distributions.

Full text of DOI:10.1063/1.441925

Nascent product vibrational state distributions of ion–molecule reactions: The proton
transfer reactions F−+HX→HF(v)+X−, X = Cl, Br, and I
James C. Weisshaar, Timothy S. Zwier, and Stephen R. Leone
Citation: The Journal of Chemical Physics 75, 4873 (1981); doi: 10.1063/1.441925
View online: http://dx.doi.org/10.1063/1.441925
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/75/10?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:
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