期刊
CHEMICAL SCIENCE
卷 7, 期 1, 页码 642-649出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc03373j
关键词
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资金
- Spanish Ministry of Science and Innovation [CTQ2012-37404-C02, Consolider Ingenio 2010 CSD2009-00038]
- US National Science Foundation [CHE-1151428, CHE-1464646]
- Division Of Chemistry [1464640] Funding Source: National Science Foundation
Differential cross sections (DSCs) of the HD(v', j') product for the reaction of H atoms with supersonically cooled D-2 molecules in a small number of initial rotational states have been measured at a collision energy of 1.97 eV. These DCSs show an oscillatory pattern that results from interferences caused by different dynamical scattering mechanisms leading to products scattered into the same solid angle. The interferences depend on the initial rotational state j of the D-2(v = 0, j) reagent and diminish in strength with increasing rotation. We present here a detailed explanation for this behavior and how each dynamical scattering mechanism has a dependence on the helicity Omega, the projection of the initial rotational angular momentum j of the D-2 reagent on the approach direction. Each helicity corresponds to a different internuclear axis distribution, with the consequence that the dependence on Omega reveals the preference of the different quasiclassical mechanisms as a function of approach direction. We believe that these results are general and will appear in any reaction for which several mechanisms are operative.
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