Positron - hydrogen and positronium - proton scattering at intermediate and high energies

K. Ratnavelu; J. Mitroy; A.T. Stelbovics

doi:10.1088/0953-4075/29/13/014

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Positron - hydrogen and positronium - proton scattering at intermediate and high energies

Journal article

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Positron - hydrogen and positronium - proton scattering at intermediate and high energies

K. Ratnavelu, J. Mitroy and A.T. Stelbovics

Journal of Physics B: Atomic, Molecular and Optical Physics, Vol.29(13), pp.2775-2796

1996

DOI: https://doi.org/10.1088/0953-4075/29/13/014

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Abstract

Positron scattering from atomic hydrogen is studied at energies ranging from 4 to 100 Ryd using the close-coupling approach and cross sections from both the - H and Ps - p entrance channels are reported in a basis comprising 1s, 2s and 2p states of the hydrogen and positronium atoms. Comparative studies with widely used approximation methods such as the first Born, unitarized Born and second Born approximations are presented. With the exception of elastic scattering for the Ps(1s) - p entrance channel, it was found that on-shell approximations such as the first Born and the unitarized Born approximations are reasonably accurate for collisions not involving particle transfer provided the energy is sufficiently high. Rearrangement collisions on the other hand are dominated by off-the-energy-shell scattering and the accurate approximation at high energies is the second Born approximation. Further, the effects of positronium channels on the direct reactions are investigated and we conclude that the positronium formation channels can be omitted for energies greater than 20 Ryd. Elastic scattering in the Ps(1s) - p entrance channel is seen to be unique, the high-energy behaviour of the phase shifts is different from any other quantum system.

Details

Title: Positron - hydrogen and positronium - proton scattering at intermediate and high energies
Authors/Creators: K. Ratnavelu (Author/Creator) - Murdoch University
J. Mitroy (Author/Creator) - Government of the Northern Territory
A.T. Stelbovics (Author/Creator) - Murdoch University
Publication Details: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol.29(13), pp.2775-2796
Publisher: Institute of Physics
Identifiers: 991005543767407891
Copyright: 1996 The Authors
Murdoch Affiliation: Centre for Atomic, Molecular and Surface Physics; School of Mathematical and Physical Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.15 Physical Chemistry; 2.15.664 Dissociative Electron Attachment
Web Of Science research areas: Optics; Physics, Atomic, Molecular & Chemical
ESI research areas: Physics