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Title: Rotationally inelastic scattering of methyl radicals with Ar and N{sub 2}

The rotationally inelastic scattering of methyl radical with Ar and N{sub 2} is examined at collision energies of 330 ± 25 cm{sup −1} and 425 ± 50 cm{sup −1}, respectively. Differential cross sections (DCSs) were measured for different final n′ rotational levels (up to n′ = 5) of the methyl radicals, averaged over k′ sub-levels, using a crossed molecular beam machine with velocity map imaging. For Ar as a collision partner, we present a newly constructed ab initio potential energy surface and quantum mechanical scattering calculations of state-resolved DCSs. These computed DCSs agree well with the measurements. The DCSs for both Ar and N{sub 2} collision partners are strongly forward peaked for all spectroscopic lines measured. For scattering angles below 60°, the theoretical CD{sub 3}–Ar DCSs show diffraction oscillations that become less pronounced as n′ increases, but these oscillations are not resolved experimentally. Comparisons are drawn with our recently reported DCSs for scattering of methyl radicals with He atoms.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS (United Kingdom)
  2. Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218-2685 (United States)
  3. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck (Austria)
Publication Date:
OSTI Identifier:
22415458
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 74 ATOMIC AND MOLECULAR PHYSICS; ARGON; COMPARATIVE EVALUATIONS; DIFFERENTIAL CROSS SECTIONS; DIFFRACTION; HELIUM; INELASTIC SCATTERING; ION-ATOM COLLISIONS; ION-MOLECULE COLLISIONS; METHYL RADICALS; MOLECULAR BEAMS; NITROGEN; OSCILLATIONS; POTENTIAL ENERGY; QUANTUM MECHANICS; SURFACES; VELOCITY