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Low-energy positron collisions with water: elastic and rotationally inelastic scattering

Baluja, KL; Zhang, R; Franz, J; Tennyson, J; (2007) Low-energy positron collisions with water: elastic and rotationally inelastic scattering. J PHYS B-AT MOL OPT , 40 (17) 3515 - 3524. 10.1088/0953-4075/40/17/018. Green open access

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Abstract

Differential, integral and momentum transfer cross sections for the vibrationally elastic and rotationally inelastic scattering of positrons from water at low collision energy ( E <= 10 eV) are reported. Several models within the R-matrix method are used to compute the body-fixed T-matrices, while the scattering calculations are performed within the fixed-nuclei approximation corrected with the standard Born-closure formula. These calculations are compared with experimental results for elastic scattering, and the best model gives reasonable agreement with the most recent measurements (Zecca et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 1597) but not with some earlier studies. The relative contribution of the rotationally inelastic processes is investigated and comparisons are made with the equivalent electron scattering cross sections.

Type: Article
Title: Low-energy positron collisions with water: elastic and rotationally inelastic scattering
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0953-4075/40/17/018
Keywords: R-MATRIX METHOD, ELECTRON-MOLECULE COLLISIONS, DIFFERENTIAL CROSS-SECTIONS, GAUSSIAN BASIS FUNCTIONS, ATOMIC BASIS SETS, FIRST-ROW ATOMS, POLYATOMIC-MOLECULES, CONTRACTION, EXCITATION, IMPACT
UCL classification: UCL
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: https://discovery.ucl.ac.uk/id/eprint/14412
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