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Title: Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, p-bar-Ar, and He{sup 2+}-Ar collisions

Abstract

Previous work on multielectron transitions in proton, antiproton, and He{sup 2+}-ion impact on neon is extended to the case of argon targets for collision energies in the 5-1000 keV/amu range. Global quantities such as net electron loss from the target, net capture, and net ionization are predicted within experimental errors using a spherically symmetric optimized effective target atom potential with dynamical screening effects based on the time-dependent net ionization probability. The inclusion of target response is crucial in order to obtain correct positions and heights for the peaks in the net ionization cross sections. Effects due to cascading following multiple outer-shell excitation are found to be appreciable at energies between 10 and 100 keV/amu, but are overestimated by the statistical model. L-shell vacancy production is reported to affect recoil charge state production at energies above 200 keV/amu for charge states q{>=}3. At low and intermediate energies, the independent-particle model is shown to overestimate q-fold recoil ion production significantly for q{>=}3 for proton impact signaling the role of electronic correlations for these channels. For antiproton impact the q=3 cross section is consistent with the independent-particle model.

Authors:
; ;  [1]
  1. Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
20632309
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 66; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.66.052719; (c) 2002 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANTIPROTONS; ARGON; ATOMS; CATIONS; CHARGE STATES; CORRELATIONS; CROSS SECTIONS; ELECTRON CAPTURE; ELECTRON LOSS; EXCITATION; HELIUM IONS; HYDROGEN IONS; ION-ATOM COLLISIONS; IONIZATION POTENTIAL; KEV RANGE; L SHELL; NEON; POTENTIALS; PROBABILITY; RECOILS; STATISTICAL MODELS; SURFACE IONIZATION; TIME DEPENDENCE; VACANCIES

Citation Formats

Kirchner, T, Horbatsch, M, Luedde, H J, Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, and Institut fuer Theoretische Physik, Universitaet Frankfurt, Robert-Mayer-Strasse 8, D-60054 Frankfurt. Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, p-bar-Ar, and He{sup 2+}-Ar collisions. United States: N. p., 2002. Web. doi:10.1103/PhysRevA.66.052719.
Kirchner, T, Horbatsch, M, Luedde, H J, Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, & Institut fuer Theoretische Physik, Universitaet Frankfurt, Robert-Mayer-Strasse 8, D-60054 Frankfurt. Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, p-bar-Ar, and He{sup 2+}-Ar collisions. United States. https://doi.org/10.1103/PhysRevA.66.052719
Kirchner, T, Horbatsch, M, Luedde, H J, Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, and Institut fuer Theoretische Physik, Universitaet Frankfurt, Robert-Mayer-Strasse 8, D-60054 Frankfurt. Fri . "Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, p-bar-Ar, and He{sup 2+}-Ar collisions". United States. https://doi.org/10.1103/PhysRevA.66.052719.
@article{osti_20632309,
title = {Time-dependent independent-particle model calculation of multiple capture and ionization processes in p-Ar, p-bar-Ar, and He{sup 2+}-Ar collisions},
author = {Kirchner, T and Horbatsch, M and Luedde, H J and Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3 and Institut fuer Theoretische Physik, Universitaet Frankfurt, Robert-Mayer-Strasse 8, D-60054 Frankfurt},
abstractNote = {Previous work on multielectron transitions in proton, antiproton, and He{sup 2+}-ion impact on neon is extended to the case of argon targets for collision energies in the 5-1000 keV/amu range. Global quantities such as net electron loss from the target, net capture, and net ionization are predicted within experimental errors using a spherically symmetric optimized effective target atom potential with dynamical screening effects based on the time-dependent net ionization probability. The inclusion of target response is crucial in order to obtain correct positions and heights for the peaks in the net ionization cross sections. Effects due to cascading following multiple outer-shell excitation are found to be appreciable at energies between 10 and 100 keV/amu, but are overestimated by the statistical model. L-shell vacancy production is reported to affect recoil charge state production at energies above 200 keV/amu for charge states q{>=}3. At low and intermediate energies, the independent-particle model is shown to overestimate q-fold recoil ion production significantly for q{>=}3 for proton impact signaling the role of electronic correlations for these channels. For antiproton impact the q=3 cross section is consistent with the independent-particle model.},
doi = {10.1103/PhysRevA.66.052719},
url = {https://www.osti.gov/biblio/20632309}, journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 66,
place = {United States},
year = {2002},
month = {11}
}