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http://hdl.handle.net/2445/9587
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DC Field | Value | Language |
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dc.contributor.author | Salvat Gavaldà, Francesc | cat |
dc.date.accessioned | 2009-10-06T10:48:32Z | - |
dc.date.available | 2009-10-06T10:48:32Z | - |
dc.date.issued | 2003 | cat |
dc.identifier.issn | 1050-2947 | cat |
dc.identifier.uri | http://hdl.handle.net/2445/9587 | - |
dc.description.abstract | 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. | eng |
dc.format.extent | 17 p. | cat |
dc.format.mimetype | application/pdf | eng |
dc.language.iso | eng | eng |
dc.publisher | The American Physical Society | eng |
dc.relation.isformatof | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.68.012708 | cat |
dc.relation.ispartof | Physical Review A, 2003, vol. 68, núm. 1, p. 012708. | eng |
dc.relation.uri | http://dx.doi.org/10.1103/PhysRevA.68.012708 | - |
dc.rights | (c) The American Physical Society, 2003 | eng |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Dispersió (Física nuclear) | cat |
dc.subject.classification | Electrons | cat |
dc.subject.other | Scattering (Physics) | eng |
dc.subject.other | Electrons | eng |
dc.title | Optical-model potential for electron and positron elastic scattering by atoms | eng |
dc.type | info:eu-repo/semantics/article | eng |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 529865 | cat |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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529865.pdf | 302.12 kB | Adobe PDF | View/Open |
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