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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Das, J.N., Dhar, S. Symmetric scattering in electron and positron impact ionization of metastable 2s-state hydrogen atoms. Pramana - J Phys 47, 263–269 (1996). https://doi.org/10.1007/BF02848527
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DOI: https://doi.org/10.1007/BF02848527