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Absolute cross sections for helium single and double ionization in collisions with fast, highly charged projectiles

Abstract

Absolute cross sections for single and double ionization of helium have been measured for highly charged (24 {<=} q {<=} 92) and fast (3.6 MeV/u {<=} E{sub p} {<=} 1 GeV/u) heavy-ion impact. The ratio of double to single ionization is found to deviate drastically from the prediction of first order theories: In the strong perturbation regime they fall below the scaling of Knudsen et al. (1984) even for 120 MeV/u U{sup 91+} impact, whereas a dramatic increase by a factor of 4 is observed in the regime of low perturbations for 0.5 and 1 GeV/u Kr{sup 36+} impact. At low reduced energies of E{sub p}/q < or approx. 0.5 the single ionization cross sections are in excellent agreement with recent CDW-EIS calculations by Fainstein et al. (1991) and close coupling calculations by Janev et al. (1980). In the entire energy range the experimental data are predicted within 50% by classical calculations of McKenzie et al. (1987). For 3.6 MeV/u and projectile charge states 24 {<=} q {<=} 55 the cross sections scale slightly weaker than q{sup 2}, as has been observed previously for the regime of strong coupling. (orig.).
Authors:
Berg, H; Unverzagt, M; Spielberger, L; Euler, J; Jagutzki, O; Schmidt-Boecking, H; [1]  Bernstein, E; [2]  Hagmann, S; [1]  Fainstein, P D; [3]  Ullrich, J; Schardt, D; Mann, R; Mokler, P
  1. Frankfurt Univ. (Germany). Inst. fuer Kernphysik
  2. Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)
  3. Centro Atomico Bariloche (Argentina)
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
GSI-91-52(prepr.)
Reference Number:
SCA: 664300; PA: DEN-92:001095; SN: 92000657447
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; HELIUM; ION-ATOM COLLISIONS; IONIZATION; GOLD IONS; RELATIVISTIC RANGE; HELIUM IONS; GEV RANGE 01-10; MEV RANGE 100-1000; EXPERIMENTAL DATA; INTEGRAL CROSS SECTIONS; EXCITATION FUNCTIONS; ENERGY DEPENDENCE; ELECTRONS; 664300; COLLISION PHENOMENA
OSTI ID:
10115884
Research Organizations:
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE92766562; TRN: DE9201095
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
28 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Berg, H, Unverzagt, M, Spielberger, L, Euler, J, Jagutzki, O, Schmidt-Boecking, H, Bernstein, E, Hagmann, S, Fainstein, P D, Ullrich, J, Schardt, D, Mann, R, and Mokler, P. Absolute cross sections for helium single and double ionization in collisions with fast, highly charged projectiles. Germany: N. p., 1991. Web.
Berg, H, Unverzagt, M, Spielberger, L, Euler, J, Jagutzki, O, Schmidt-Boecking, H, Bernstein, E, Hagmann, S, Fainstein, P D, Ullrich, J, Schardt, D, Mann, R, &amp; Mokler, P. Absolute cross sections for helium single and double ionization in collisions with fast, highly charged projectiles. Germany.
Berg, H, Unverzagt, M, Spielberger, L, Euler, J, Jagutzki, O, Schmidt-Boecking, H, Bernstein, E, Hagmann, S, Fainstein, P D, Ullrich, J, Schardt, D, Mann, R, and Mokler, P. 1991. "Absolute cross sections for helium single and double ionization in collisions with fast, highly charged projectiles." Germany.
@misc{etde_10115884,
title = {Absolute cross sections for helium single and double ionization in collisions with fast, highly charged projectiles}
author = {Berg, H, Unverzagt, M, Spielberger, L, Euler, J, Jagutzki, O, Schmidt-Boecking, H, Bernstein, E, Hagmann, S, Fainstein, P D, Ullrich, J, Schardt, D, Mann, R, and Mokler, P}
abstractNote = {Absolute cross sections for single and double ionization of helium have been measured for highly charged (24 {<=} q {<=} 92) and fast (3.6 MeV/u {<=} E{sub p} {<=} 1 GeV/u) heavy-ion impact. The ratio of double to single ionization is found to deviate drastically from the prediction of first order theories: In the strong perturbation regime they fall below the scaling of Knudsen et al. (1984) even for 120 MeV/u U{sup 91+} impact, whereas a dramatic increase by a factor of 4 is observed in the regime of low perturbations for 0.5 and 1 GeV/u Kr{sup 36+} impact. At low reduced energies of E{sub p}/q < or approx. 0.5 the single ionization cross sections are in excellent agreement with recent CDW-EIS calculations by Fainstein et al. (1991) and close coupling calculations by Janev et al. (1980). In the entire energy range the experimental data are predicted within 50% by classical calculations of McKenzie et al. (1987). For 3.6 MeV/u and projectile charge states 24 {<=} q {<=} 55 the cross sections scale slightly weaker than q{sup 2}, as has been observed previously for the regime of strong coupling. (orig.).}
place = {Germany}
year = {1991}
month = {Oct}
}