Deep minima in the Coulomb-Born triply differential cross sections for ionization of helium by electron and positron impact
Deep minima in the Coulomb-Born triply differential cross sections for ionization of helium by electron and positron impact
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电子和正电子碰撞氦电离的库仑三微分截面中的深极小值
DOI:
10.1140/epjd/e2019-100512-x
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Ward, Sandra J.
中科院分区:
文献类型:
--
作者:
DeMars, Cody M.;Kent, Jesse B.;Ward, Sandra J.
AbstractPreviously, a deep minimum in the measurements of the triply differential cross section (TDCS) for electron-helium ionization at an incident energy of 64.6 eV was interpreted in terms of a vortex. We apply the Coulomb-Born (CB1) and modified CB1 approximations to this process at the same incident energy and obtain a deep minimum whose position is in reasonable accord with time-dependent close-coupling results and experimental data. We also obtain the deep minimum in the TDCS that was measured for an energy of 74.6 eV. For both incident energies, but at slightly different gun angles to those used experimentally, we obtain a very deep minimum in the TDCS that is related to a vortex in the velocity field associated with the CB1 transition matrix element. We determine for energies of 44.6 eV–79.6 eV the gun and polar angles for a deep minimum in the CB1 TDCS. We apply both approximations to positron-helium ionization. For an incident energy of 205.25 eV we find a deep minimum in the TDCS that is related to a vortex in the velocity field associated with the CB1 transition matrix element.Graphical abstract
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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
F. Navarrete;R. Barrachina
通讯作者:
R. Barrachina
影响因子:
8.6
作者:
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通讯作者:
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DOI:
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1992
期刊:
Physical Review A. Atomic, Molecular, and Optical Physics
影响因子:
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作者:
Botero;Macek
通讯作者:
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DOI:
10.1103/physreva.47.3724
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1993
期刊:
Physical review. A, Atomic, molecular, and optical physics
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
S. Y. Ovchinnikov;J. Macek;D. Schultz
通讯作者:
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