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Type: Artigo de periódico
Title: Annihilation Dynamics Of Positrons In Molecular Environments
Author: Da Silva E.P.
Germano J.S.E.
Lino J.L.S.
De Carvalho C.R.C.
Natalense A.P.P.
Lima M.A.P.
Abstract: We present recent results for positron-molecule scattering obtained with the Schwinger multichannel method. Our calculations include integral, differential and momentum transfer cross sections and the annihilation parameter Zeff for C2H2 and C2H4 molecules. We discuss a mechanism for annihilation of positrons in low-energy positron-molecule scattering. We interpret the annihilation process through virtual electronic excitation of the target combined with electronic cloud relaxation and virtual positronium formation. We study the influence of the first electronic state of the target on the cross section and on the annihilation parameter in C+-C2H2 scattering. © 1998 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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