Deep Minima in the Triply Differential Cross Section for Ionization of Atomic Hydrogen by Electron and Positron Impact

DeMars, C. M.; Ward, S. J.; Colgan, James Patrick; Amami, S.; Madison, D.

doi:10.3390/atoms8020026

Deep Minima in the Triply Differential Cross Section for Ionization of Atomic Hydrogen by Electron and Positron Impact

Journal Article · Fri May 29 00:00:00 EDT 2020 · Atoms

DOI:https://doi.org/10.3390/atoms8020026· OSTI ID:1648103

^[1]; ^[1]; ^[2]; Amami, S. ^[3]; Madison, D. ^[3]

Univ. of North Texas, Denton, TX (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Missouri Univ. of Science and Technology, Rolla, MI (United States)

We investigate ionization of atomic hydrogen by electron- and positron-impact. We apply the Coulomb–Born (CB1) approximation, various modified CB1 approximations, the three body distorted wave (3DW) approximation, and the time-dependent close-coupling (TDCC) method to electron-impact ionization of hydrogen. For electron-impact ionization of hydrogen for an incident energy of approximately 76.45 eV, we obtain a deep minimum in the CB1 triply differential cross section (TDCS). However, the TDCC for 74.45 eV and the 3DW for 74.46 eV gave a dip in the TDCS. For positron-hydrogen ionization (breakup) we apply the CB1 approximation and a modified CB1 approximation. We obtain a deep minimum in the TDCS and a zero in the CB1 transition matrix element for an incident energy of 100 eV with a gun angle of 56.13 °. Corresponding to a zero in the CB1 transition matrix element, there is a vortex in the velocity field associated with this element. For both electron- and positron-impact ionization of hydrogen the velocity field rotates in the same direction, which is anticlockwise. All calculations are performed for a doubly symmetric geometry; the electron-impact ionization is in-plane and the positron-impact ionization is out-of-plane.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1648103

Report Number(s):: LA-UR--20-23131

Journal Information:: Atoms, Journal Name: Atoms Journal Issue: 2 Vol. 8; ISSN 2218-2004

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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74 ATOMIC AND MOLECULAR PHYSICS
electron-impact ionization
hydrogen
positron-impact ionization
velocity field
vortices

Deep Minima in the Triply Differential Cross Section for Ionization of Atomic Hydrogen by Electron and Positron Impact

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