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http://hdl.handle.net/2445/9587
Title: | Optical-model potential for electron and positron elastic scattering by atoms |
Author: | Salvat Gavaldà, Francesc |
Keywords: | Dispersió (Física nuclear) Electrons Scattering (Physics) Electrons |
Issue Date: | 2003 |
Publisher: | The American Physical Society |
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. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.68.012708 |
It is part of: | Physical Review A, 2003, vol. 68, núm. 1, p. 012708. |
URI: | http://hdl.handle.net/2445/9587 |
Related resource: | http://dx.doi.org/10.1103/PhysRevA.68.012708 |
ISSN: | 1050-2947 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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