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Phys. Rev. A 77, 042715 (2008) [7 pages]

Electron scattering in ethene: Excitation of the ã 3B1u state, elastic scattering, and vibrational excitation

M. Allan
Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland

C. Winstead and V. McKoy
A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA
Received 8 February 2008; published 16 April 2008

Experimental and calculated absolute differential cross sections for the scattering of low-energy electrons from ethene are presented. Emphasis is on the excitation of the ã 3B1u 3(pi,pi*) state, but selected elastic and vibrational excitation cross sections are also given. In contrast to earlier calculations, which were nearly a factor of 2 too large, the present calculation agrees very well with the experimental triplet excitation cross section in the threshold region. The improvement is due primarily to the inclusion of target polarization, which results in proper positioning of the pi* resonance, whose high-energy tail dominates the triplet state excitation near threshold. The present experimental elastic cross sections agree very well with recent calculations taking into account target polarization.

©2008 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.77.042715
DOI: 10.1103/PhysRevA.77.042715
PACS: 34.80.Gs; 34.80.Bm
  • 34.80.Gs
    Molecular excitation and ionization by electron/positron impact
  • 34.80.Bm
    Elastic scattering of electrons/positrons by atoms and molecules
  • YEAR: 2008
KEYWORDS: excited states, molecule-electron collisions, organic compounds, vibrational states

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