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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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Volume 227, Issue 9-11


Simultaneous Measurement of Reactive and Inelastic Scattering: Differential Cross Section of the H + HD → HD(v′, j′) + H Reaction

Justin Jankunas / Mahima Sneha / Richard N. Zare / Foudhil Bouakline / Stuart C. Althorpe
Published Online: 2013-08-05 | DOI: https://doi.org/10.1524/zpch.2013.0407


The H + HD → HD(ν′, j′) + H reaction has been studied experimentally and theoretically. Differential cross sections of HD(ν′, j′) products have been measured by means of a Photoloc technique and calculated using a time-independent quantum mechanical theory. Three product states: HD(ν′ = 1, j′ = 8) at a collision energy (Ecoll) of 1.97 eV; HD(ν′ = 2, j′ = 3) at Ecoll = 1.46 eV; and HD(ν′ = 2, j′ = 5) at Ecoll = 1.44 eV, show very good agreement between theory and experiment. The other two, highly rotationally excited states studied, HD(ν′ = 1, j′ = 12) and HD(ν′ = 1, j′ = 13) at Ecoll = 1.97 eV, exhibit a noticeable disagreement between experiment and theory. This is consistent with our most recent findings on the H + D2 → HD(ν′, j′) + D reaction, wherein the differential cross sections of HD(ν′ = 1, high j′) product states showed similar disagreement between the experiment and theory [J. Jankunas, M. Sneha, R. N. Zare, F. Bouakline, and S. C. Althorpe, J. Chem. Phys. 138 (2013) 094310]. In all five cases, however, we find overwhelming support that the experimental signal is a sum of reactive and inelastic scattering events. The interference term escapes detection, frustrating our attempt to observe geometric phase effects. Nevertheless, this work constitutes a first experimental example in which the indistinguishability of reactive and inelastic channels must be taken into account explicitly when constructing differential cross sections.

Keywords: Reaction Dynamics; H + H; Differential Cross Section; Geometric Phase

About the article

Received: 2013-02-28

Published Online: 2013-08-05

Published in Print: 2013-11-01

Citation Information: Zeitschrift für Physikalische Chemie, Volume 227, Issue 9-11, Pages 1281–1300, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2013.0407.

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© 2013 by Walter de Gruyter Berlin Boston. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. BY-NC-ND 4.0

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