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

Technical Report:

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

Technical Report:

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, & 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}
}