Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/106747
Type: Artigo de periódico
Title: Polarization Effects On Electronic Excitation Of The A B3 1u State Of Ethylene By Low-energy Electron Impact
Author: Da Costa R.F.
Bettega M.H.F.
Lima M.A.P.
Abstract: In this work, we investigated the influence of polarization effects on the electronic excitation of the a B3 1u state of ethylene. We employed the Schwinger multichannel method implemented with pseudopotentials to compute the elastic and the inelastic scattering cross sections for energies between 0 and 8 eV. Elastic calculations were performed in the static-exchange and static-exchange plus polarization approximations, and inelastic calculations were performed in a two-channel approximation with and without the inclusion of polarization effects. The scattering amplitudes are generated in the scope of the minimal orbital basis for single configuration interactions strategy. Ethylene presents a shape resonance in the B2 2g symmetry located close to the threshold of the a B3 1u state. We show that the inclusion of polarization effects has a great influence on the excitation cross section and also that, in this case, just the two-channel close coupling without polarization is not enough to provide reliable results. In particular, our computed inelastic differential cross sections obtained with the proper treatment of polarization are in better agreement with the experimental values. They are smaller in magnitude than those obtained in the two-channel calculation without the inclusion of polarization effects. These results confirm our expectations reported in a recent publication on electron collisions with furan. © 2008 The American Physical Society.
Editor: 
Rights: aberto
Identifier DOI: 10.1103/PhysRevA.77.042723
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-43049123474&partnerID=40&md5=07ba33cc35685358209785b7b46bf68e
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
2-s2.0-43049123474.pdf109.6 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.