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Ionization in low-keV-energy Ar+Ar collisions

Ionization in low-keV-energy Ar+Ar collisions Ionization in Ar+Ar collisions is studied at beam energies of 2.00, 2.50, and 3.00 keV over an angular range from 2.0° to 12.0°. The ionization probability ( P 1 ) shows a threshold for τ ≈ 5 keV deg and a second rise for τ ≈ 25 keV deg. The scattered ion beam is energy analyzed at selected energies and angles. For 2 < τ < 12 keV deg the ion energy-loss spectra show a double-peaked structure, at an 18-eV and at a 29-eV energy loss. At larger τ there is predominately one peak in the spectra at 43 eV. The energy losses and τ dependence of P 1 suggest that the 29- and 43-eV processes involve excitation of autoionizing states. Additional results at beam energies of 0.50, 0.75, 1.00, and 1.50 keV show P 1 ( τ ) to be velocity dependent at these lower energies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Ionization in low-keV-energy Ar+Ar collisions

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1975 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.11.1239
Publisher site
See Article on Publisher Site

Abstract

Ionization in Ar+Ar collisions is studied at beam energies of 2.00, 2.50, and 3.00 keV over an angular range from 2.0° to 12.0°. The ionization probability ( P 1 ) shows a threshold for τ ≈ 5 keV deg and a second rise for τ ≈ 25 keV deg. The scattered ion beam is energy analyzed at selected energies and angles. For 2 < τ < 12 keV deg the ion energy-loss spectra show a double-peaked structure, at an 18-eV and at a 29-eV energy loss. At larger τ there is predominately one peak in the spectra at 43 eV. The energy losses and τ dependence of P 1 suggest that the 29- and 43-eV processes involve excitation of autoionizing states. Additional results at beam energies of 0.50, 0.75, 1.00, and 1.50 keV show P 1 ( τ ) to be velocity dependent at these lower energies.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Apr 1, 1975

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