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Effects of reagent rotation on interferences in the product angular distributions of chemical reactions

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)642-649
Number of pages8
JournalChemical Science
Volume7
Issue number1
DOIs
DateAccepted/In press - 5 Oct 2015
DatePublished (current) - 1 Jan 2016

Abstract

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 Ω, 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 Ω 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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