Elaborate treatment of the inelastic collisions of positrons with alkali atoms and alkaline-earth positive ions using a restricted coupled-static approximation |
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Authors: | Mohamed Assad Abdel-Raouf |
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Affiliation: | 1. International Centre for Theoretical Physics, 34100, Trieste, Italia 2. Chair for Theoretical Chemistry, Friedrich-Alexander, Universit?t Erlangen-Nürnberg, Egerlandstr. 3, D-8520, Erlangen, FRG
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Abstract: | Summary We present the results of a very elaborate investigation of the inelastic collisions of positrons with the ground states of the first four alkali atoms (3Li,11Na,19K and38Rb) and their electronically resemblant alkaline-earth positive ions,i.e. 4Be+,12Mg+,20Ca+ and39Sr+, respectively, using a restricted coupled-static approximation in which the reactance matrices are adjusted to be symmetrical. Our interest is concentrated on the calculation of the total elastic and positronium formation cross-sections and their behaviour in the low-energy region (below 10 eV for the atoms) or the regions above the positronium formation thresholds (when the ions are considered). Our results are the most accurate cross-sections expected from the approximation employed. They reveal, within their limits, the most important characteristics of these cross-sections and provide us with a satisfactory comparison between the main features of positron-atom and positron-ion collisions. Present address. |
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Keywords: | Inelastic scattering of atoms and molecules |
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