Test of local model potentials for positron scattering from rare gases

Journal Article · Tue Nov 30 23:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.4321· OSTI ID:5798376

Gianturco, F A ^[1]; Jain, A ^[2]; Rodriguez-Ruiz, J A ^[3]

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1. Department of Chemistry, The University of Rome, 00185 Rome (Italy)
2. Physics Department, Florida A M University, Tallahassee, Florida 32307 (United States)
3. Departamento de Quimica Fisica, Universidad de Malaga, 29071 Malaga (Spain)

We report calculations of differential and integral cross sections for positron ([ital e][sup +]) scattering from He, Ne, Ar, Kr, and Xe rare gases. An optical-potential approach is employed in which the repulsive Coulombic interaction is calculated exactly at the Hartree-Fock level and the attractive polarization and correlation effects are included via a model potential determined from the use of a local density-functional theory (DFT). These model calculations are further compared with the results from two other local potentials, one based on determining the short-range correlation energy, [ital E][sub C], for a positron in an homogeneous electron gas and the other from the correlation-polarization potential of an electron interacting with a free-electron gas. We found that the present DFT-based, correlation-polarization treatment is fairly simple to implement computationally and appears to be the most accurate of all the models examined here. Our results are in fact compared with recent measurements of differential and integral cross sections for positron scattering with rare gases and are found to be remarkably close to both sets of experiments.

• OSTI ID: 5798376
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CALCULATION METHODS
COLLISIONS
COULOMB FIELD
CROSS SECTIONS
ELECTRIC FIELDS
ELEMENTS
ENERGY
FLUIDS
GASES
HARTREE-FOCK METHOD
NONMETALS
OPTICAL MODELS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POTENTIAL ENERGY
RARE GASES