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

Allan, M. and Winstead, C. and McKoy, V. (2008) Electron scattering in ethene: Excitation of the ã 3B1u state, elastic scattering, and vibrational excitation. Physical Review A, 77 (4). Art. No. 042715. ISSN 1050-2947. doi:10.1103/PhysRevA.77.042715.

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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.

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Additional Information:©2008 The American Physical Society. (Received 8 February 2008; published 16 April 2008) We thank Cynthia Trevisan and Tom Rescigno for providing their calculated cross sections in numerical form and Marco A.P. Lima for helpful discussions. This research is part of Swiss National Science Foundation Project No. 200020-113599/1. The work of C.W. and V.M. was supported by the Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, and employed the resources of the Jet Propulsion Laboratory’s Supercomputing and Visualization Facility.
Subject Keywords:excited states; molecule-electron collisions; organic compounds; vibrational states
Issue or Number:4
Record Number:CaltechAUTHORS:ALLpra08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10244
Deposited By: Archive Administrator
Deposited On:18 Apr 2008
Last Modified:08 Nov 2021 21:06

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