Abstract
First Born triple differential cross sections (TDCS) for ionization of metastable 3P-state hydrogen atoms by electrons are calculated for various kinematic conditions in the asymmetric coplanar geometry. A multiple scattering theory is used in this study. The present results are compared with other existing related theoretical results for ionizations of hydrogen atoms from metastable 2S-state and 2P-state, showing a good qualitative agreement. There is no available theoretical study for ionization of metastable 3P-state hydrogen atoms by electrons. We are expecting that the present results provide a wide scope for further study of such ionization problems.
Highlights
Hydrogen atom is one of the most abundant elements in the universe and is one of the simplest elements
Total differential cross section for the ionization of atoms and molecules by electron impact is one of the essential sets of data needed in a wide range of various applications
The triple differential cross sections (TDCS) is a measure of the probability that in an (e, 2e) reaction an incident electron of momentum pi and energy Ei will produce on collision with the target two electrons having energies E1 and E2 and momenta p1 and p2 emitted respectively into the solid angles dΩ1 and dΩ2 centred about the directions (θ1,φ1 ) and (θ2,φ2 )
Summary
Hydrogen atom is one of the most abundant elements in the universe and is one of the simplest elements. From this point of view, electron impact ionization of metastable atoms is finding potential importance for understanding of mechanisms occurring in many research areas, e.g., astrophysics, plasma physics and in life sciences. The TDCS for the (e, 2e) processes were widely studied for the ground state hydrogen atom both experimentally [22]-[24] and theoretically [25]-[29]. Though there is the scarcity of any theoretical and experimental results on TDCS for ionization of hydrogen atoms by electrons from metastable 3P-state, the present First Born results for ionization from the 3P-state may be expected to be good, interesting and significant. The present calculation reveals new features in the cross section curves which may be confirmed by experiments
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