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Differential cross sections for elastic positron-H<sup>2</sup> collisions using the R-matrix method

Danby, G; Tennyson, J; (1990) Differential cross sections for elastic positron-H<sup>2</sup> collisions using the R-matrix method. Journal of Physics B: Atomic, Molecular and Optical Physics , 23 (6) pp. 1005-1015. 10.1088/20150006220063.

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Abstract

Results are presented for positron-H2 collision cross sections for energies below the positronium formation threshold. Calculations are performed with a variety of target representations, including full configuration interaction within a basis of Slater-type orbitals, and several models. The most sophisticated model includes the use of pseudo-excited electronic states of the target to account for intermediate-range polarisation effects. Short- and long-range polarisation effects are also considered. Calculations are performed for Sigma Σg+, Σu+, Πu, Πg, Delta Δg and Delta Δu symmetries which are combined to give differential cross sections as a function of energy. These calculations underestimate the Sigma Σg+ eigenphase sum but perform better for the higher symmetries. The differential cross sections show a minimum for angles about 45° which should be amenable to experiment. A computationally more efficient reformulation of the positron-molecule scattering problem is presented within the R-matrix method. Corrections are given for some previously published results. © 1990 IOP Publishing Ltd.

Type: Article
Title: Differential cross sections for elastic positron-H<sup>2</sup> collisions using the R-matrix method
DOI: 10.1088/20150006220063
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/1499147
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