Differential cross sections for elastic and inelastic positron scattering from alkali atoms |
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| Authors: | K. Bartschat K. M. De Vries R. P. McEachran A. D. Stauffer |
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| Affiliation: | (1) Joint Institute for Laboratory Astrophysics, University of Colorado and National Institute of Standards and Technology, 80309 Boulder, CO, USA;(2) Department of Physics and Astronomy, Drake University, 50311 Des Moines, IA, USA;(3) Department of Physics and Astronomy, York University, M3J 1P3 Toronto, Canada |
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| Abstract: | We have investigated positron scattering from the alkali atoms lithium, sodium, potassium and rubidium, focusing on the calculation of differential cross sections for elastic scattering and impact excitation. The results obtained with the two-state and five-state close-coupling method as well as the first-order distorted wave Born approximation are compared with each other and with some selected results for electron scattering. Numerical problems due to lack of, or numerically inaccurate, calculation of partial waves with large angular momenta are solved through semi-empirical fitting/extrapolation procedures. |
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