Polarisation effects in low-energy positron-molecule scattering |
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Authors: | J Franz KL Baluja J Tennyson |
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Affiliation: | a Department of Physics and Astronomy, University College London, London WC1E 6BT, UK b Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India |
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Abstract: | The UK molecular R-matrix method has been adapted to treat positron collisions from polyatomic targets. A simple empirical enhancement factor which corrects for the underestimation of electron-positron polarisation and correlation effects in the calculations performed with the static-plus-polarization model at low scattering energies is presented. Application of this model to positron scattering from carbon dioxide at energies below 8 eV is discussed. Introduction of the enhancement factor improves the integral cross sections significantly and introduces structures in the differential cross sections consistent with other studies. The prospects for a fully ab initio treatment of this problem are discussed. |
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Keywords: | 34 80 Uv |
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