A molecular beam study of the H + N3 reaction. Product NH internal state distribution and electronic state branching ratio

Article abstract of DOI:10.1063/1.458735

The H + N3 -> NH(X³Σ^-, a¹Δ, b¹Σ⁺) + N2 reaction has been studied in a molecular beam-gas scattering arrangement in order to determine the nascent product state distribution.The NH product in specific rovibronic/fine-structure states has been detected by laser fluorescence excitation.The relative cross sections for formation of various vibrational levels in the a¹Δ electronic state were determined to equal 1:1.0 +/- 0.3:1.4 +/- 0.3:<*>1.5 for v = 0 through 3, inclusive, while the v = 0 to v = 1 population ratio in the X³Σ^- state was found to be 1:0.015 +/- 0.003.The rotational distributions in all vibronic levels were found to be characterized by temperatures near 300 K, suggestive of relaxation of the nascent rotational distributions.By comparison of the populations of a specific pair of X³Σ^- and a¹Δ state levels and with summation over the derived rovibrational distributions, an electronic state branching ratio of 3.2 +/- 1.3 was obtained for the X³Σ^- to a ¹Δ electronic state branching ratio.An upper limit of <*> 0.02 was also derived for the ratio of the b¹Σ⁺ v = 0 to a¹Δ v = 0 populations.These results are compared with NH fragment distributions observed in the photodissociation of HN3(<*>X¹A') and with our expectations based on our fragmentary knowledge of HN3 potential energy surfaces.

Full text of DOI:10.1063/1.458735

A molecular beam study of the H+N3 reaction. Product NH internal state distribution
and electronic state branching ratio
Jing Chen, Edwin Quiñones, and Paul J. Dagdigian
Citation: The Journal of Chemical Physics 93, 4033 (1990); doi: 10.1063/1.458735
View online: http://dx.doi.org/10.1063/1.458735
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/93/6?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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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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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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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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58

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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58

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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58

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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58

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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58

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:
128.114.34.22 On: Sat, 29 Nov 2014 10:15:58