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Seemingly anomalous angular distributions in H+D-2 reactive scattering

  • When a hydrogen (H) atom approaches a deuterium (D-2) molecule, the minimum-energy path is for the three nuclei to line up. Consequently, nearly collinear collisions cause HD reaction products to be backscattered with low rotational excitation, whereas more glancing collisions yield sideways-scattered HD products with higher rotational excitation. Here we report that measured cross sections for the H + D-2 -> HD(v' = 4, j') + D reaction at a collision energy of 1.97 electron volts contradict this behavior. The anomalous angular distributions match closely fully quantum mechanical calculations, and for the most part quasiclassical trajectory calculations. As the energy available in product recoil is reduced, a rotational barrier to reaction cuts off contributions from glancing collisions, causing high-j' HD products to become backward scattered.

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Author:Justin Jankunas, Richard N. Zare, Foudhil Bouakline, Stuart C. Althorpe, Diego Herraez-Aguilar, F. Javier Aoiz
ISSN:0036-8075 (print)
Parent Title (English):Science
Publisher:American Assoc. for the Advancement of Science
Place of publication:Washington
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
First Page:1687
Last Page:1690
Funder:U.S. National Science Foundation [NSF CHE-1025960]; Alexander von Humboldt Foundation; UK Engineering and Physical Sciences Research Council; Spanish Ministry of Science and Innovation (MCINN) [CTQ2008-02578, CSD2009-00038]; FPU [AP2009-0038]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert