State selected ion-molecule reactions by a TESICO technique. X. O+(ν) + CH4

Article abstract of DOI:10.1063/1.450572

Vibrational state selected (relative) reaction cross sections have been determined for ν=4-3 of the O2⁺ ion, for each of the three product channels of the reaction O2⁺(ν) + CH4, viz.O2⁺ (ν) + CH4 -> CH3O2⁺ + H ( 1 ) -> CH3⁺ + HO2 ( 2 ) -> CH4⁺ + O2, ( 3 ) using the TESICO (threshold electron-secondary ion coincidence) technique.At a fixed collision energy of 0.27 eV, it has been found that the cross section of exoergic channel ( 1 ) increases most prominently with increasing vibrational quantum number ν in the range ν = 0-2, but decreases sharply in going from ν = 2 to ν = 3.The cross sections of endoergic channels ( 2 ) and ( 3 ) also increase with increasing ν but their rates of increase are much smaller than that of channel ( 1 ) in the range ν = 0-2.When ν is increased to 3, however, charge transfer channel ( 3 ) is enhanced dramatically and the CH4⁺ ion becomes the most abundant product ion.The cross section of channel ( 2 ) also increases more sharply in going from ν = 2 to ν = 3 than in the range ν = 0-2, but the CH3⁺ ion still remains the least abundant of the three product ions.As a result of these variations in the individual cross sections, the overall cross section for the O2⁺ + CH4 reaction increases monotonically with increasing ν throughout the range studied (ν = 4-3) .The results are compared with that of the collision energy dependence as obtained in drift and flow- drift experiments and the implications are discussed in conjunction with the structure of the CH3O2⁺ ion and the relevant potential energy surfaces.

Full text of DOI:10.1063/1.450572

State selected ion–molecule reactions by a TESICO technique. X. O+ 2(v)+CH4
Kenichiro Tanaka, Tatsuhisa Kato, and Inosuke Koyano
Citation: The Journal of Chemical Physics 84, 750 (1986); doi: 10.1063/1.450572
View online: http://dx.doi.org/10.1063/1.450572
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/84/2?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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37

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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37

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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37

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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37

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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37

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:
130.113.111.210 On: Tue, 23 Dec 2014 13:08:37