Symmetric scattering in electron and positron impact ionization of metastable 2s-state hydrogen atoms |
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Authors: | J N Das S Dhar |
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Affiliation: | (1) Department of Applied Mathematics, University College of Science, 92, Acharya Prafulla Chandra Road, 700 009 Calcutta, India |
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Abstract: | Triple differential cross sections for ionization of hydrogen atoms in the metastable 2s-state by the impact of electrons and positrons have been calculated for coplanar symmetric geometry. In this calculation a multiple scattering theory due to Das [10] and Das and Seal [11] has been used. An analysis of the results reveals that unlike scattering from the ground state, scattering from 2s-state is essentially a higher order process except for the binary collision direction. Moreover, here, the cross section results for 2s-state are much larger compared to those for scattering from the ground state. It is also found that the ionization mechanism at large scattering angles for ionization from the 2s-state is different from that for ionization from the ground state. |
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Keywords: | Cross section collision ionization scattering electron positron |
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