Optical-model potential for electron and positron elastic scattering by atoms

An optical-model potential for systematic calculations of elastic scattering of electrons and positrons by atoms and positive ions is proposed. The electrostatic interaction is determined from the Dirac-Hartree-Fock self-consistent atomic electron density. In the case of electron projectiles, the ex...

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Author: Salvat Gavaldà, Francesc
Format: article
Status:Published version
Publication Date:2003
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/9587
Online Access:https://hdl.handle.net/2445/9587
Access Level:Open access
Keyword:Dispersió (Física nuclear)
Electrons
Scattering (Physics)
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spelling Optical-model potential for electron and positron elastic scattering by atomsSalvat Gavaldà, FrancescDispersió (Física nuclear)ElectronsScattering (Physics)ElectronsAn optical-model potential for systematic calculations of elastic scattering of electrons and positrons by atoms and positive ions is proposed. The electrostatic interaction is determined from the Dirac-Hartree-Fock self-consistent atomic electron density. In the case of electron projectiles, the exchange interaction is described by means of the local-approximation of Furness and McCarthy. The correlation-polarization potential is obtained by combining the correlation potential derived from the local density approximation with a long-range polarization interaction, which is represented by means of a Buckingham potential with an empirical energy-dependent cutoff parameter. The absorption potential is obtained from the local-density approximation, using the Born-Ochkur approximation and the Lindhard dielectric function to describe the binary collisions with a free-electron gas. The strength of the absorption potential is adjusted by means of an empirical parameter, which has been determined by fitting available absolute elastic differential cross-section data for noble gases and mercury. The Dirac partial-wave analysis with this optical-model potential provides a realistic description of elastic scattering of electrons and positrons with energies in the range from ~100 eV up to ~5 keV. At higher energies, correlation-polarization and absorption corrections are small and the usual static-exchange approximation is sufficiently accurate for most practical purposes.The American Physical Society200920092003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion17 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/9587Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.68.012708Physical Review A, 2003, vol. 68, núm. 1, p. 012708.http://dx.doi.org/10.1103/PhysRevA.68.012708(c) The American Physical Society, 2003info:eu-repo/semantics/openAccessoai:recercat.cat:2445/95872026-05-29T05:05:01Z
dc.title.none.fl_str_mv Optical-model potential for electron and positron elastic scattering by atoms
title Optical-model potential for electron and positron elastic scattering by atoms
spellingShingle Optical-model potential for electron and positron elastic scattering by atoms
Salvat Gavaldà, Francesc
Dispersió (Física nuclear)
Electrons
Scattering (Physics)
Electrons
title_short Optical-model potential for electron and positron elastic scattering by atoms
title_full Optical-model potential for electron and positron elastic scattering by atoms
title_fullStr Optical-model potential for electron and positron elastic scattering by atoms
title_full_unstemmed Optical-model potential for electron and positron elastic scattering by atoms
title_sort Optical-model potential for electron and positron elastic scattering by atoms
dc.creator.none.fl_str_mv Salvat Gavaldà, Francesc
author Salvat Gavaldà, Francesc
author_facet Salvat Gavaldà, Francesc
author_role author
dc.subject.none.fl_str_mv Dispersió (Física nuclear)
Electrons
Scattering (Physics)
Electrons
topic Dispersió (Física nuclear)
Electrons
Scattering (Physics)
Electrons
description An optical-model potential for systematic calculations of elastic scattering of electrons and positrons by atoms and positive ions is proposed. The electrostatic interaction is determined from the Dirac-Hartree-Fock self-consistent atomic electron density. In the case of electron projectiles, the exchange interaction is described by means of the local-approximation of Furness and McCarthy. The correlation-polarization potential is obtained by combining the correlation potential derived from the local density approximation with a long-range polarization interaction, which is represented by means of a Buckingham potential with an empirical energy-dependent cutoff parameter. The absorption potential is obtained from the local-density approximation, using the Born-Ochkur approximation and the Lindhard dielectric function to describe the binary collisions with a free-electron gas. The strength of the absorption potential is adjusted by means of an empirical parameter, which has been determined by fitting available absolute elastic differential cross-section data for noble gases and mercury. The Dirac partial-wave analysis with this optical-model potential provides a realistic description of elastic scattering of electrons and positrons with energies in the range from ~100 eV up to ~5 keV. At higher energies, correlation-polarization and absorption corrections are small and the usual static-exchange approximation is sufficiently accurate for most practical purposes.
publishDate 2003
dc.date.none.fl_str_mv 2003
2009
2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/9587
url https://hdl.handle.net/2445/9587
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.68.012708
Physical Review A, 2003, vol. 68, núm. 1, p. 012708.
http://dx.doi.org/10.1103/PhysRevA.68.012708
dc.rights.none.fl_str_mv (c) The American Physical Society, 2003
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 2003
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 17 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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