A modified adiabatic approach to positron-atom and positron-molecule polarisation potentials: application to positron-He scattering
- 28 February 1990
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 23 (4) , 767-776
- https://doi.org/10.1088/0953-4075/23/4/010
Abstract
A novel treatment of short-range correlation effects designed for use in calculating positron-atom and positron-molecule polarisation potentials is presented. The treatment is based on a physically motivated approximation that mimics the effect of the dominant non-adiabatic correction to the adiabatic potential at low scattering energies, namely virtual positronium formation. As an initial test of the method, positron-He scattering phaseshifts, scattering length and differential cross sections have been calculated and found to be in good agreement with accurate results. This method is immediately extendible to positron-molecule collisions and does not require significantly more work than a purely adiabatic treatment.Keywords
This publication has 35 references indexed in Scilit:
- The theory of low-energy positron collisions with moleculesPhysics Reports, 1988
- The theoretical treatment of low-energy e+-H2scattering using Kohn trial functions containing Hylleraas-type functionsJournal of Physics B: Atomic and Molecular Physics, 1987
- An improved theoretical value for Zefffor low-energy positron-hydrogen-molecule scatteringJournal of Physics B: Atomic and Molecular Physics, 1986
- A calculation of Zefffor low-energy positron-hydrogen-molecule scatteringJournal of Physics B: Atomic and Molecular Physics, 1985
- The inclusion of π functions in the treatment of low-energy positron-hydrogen-molecule scattering by a generalisation of the Kohn methodJournal of Physics B: Atomic and Molecular Physics, 1985
- Cu I-, Ni I- Co I-like spectra of cadmium and indium in laser-produced plasmaJournal of Physics B: Atomic and Molecular Physics, 1984
- Total scattering cross sections for low-energy positrons in the molecular gases H2, N2, CO2, O2and CH4Journal of Physics B: Atomic and Molecular Physics, 1983
- The scattering of p-wave positrons by heliumJournal of Physics B: Atomic and Molecular Physics, 1975
- Dipole Polarizabilities of theandStates of He andPhysical Review B, 1966
- On the theory of elastic collisions between electrons and hydrogen atomsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1960