Experimental separation of photoabsorption and Compton scattering contributions to He single and double ionization

Journal Article · Sun Feb 25 00:00:00 EST 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.49792· OSTI ID:21156256

Spielberger, L; Jagutzki, O; Doerner, R; Ullrich, J; Meyer, U; Mergel, V; Unverzagt, M; Damrau, M; Vogt, T; Ali, I; Khayyat, Kh; Bahr, D; Schmidt, H G; Frahm, R; Schmidt-Boecking, H ^[1]

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1. Institut fuer Kernphysik, Universitaet Frankfurt, D60486 Frankfurt/M., Germany, D60486 Hamburg (Germany)

We have experimentally separated the contributions of photoabsorption and Compton scattering to He single and double ionization for high-energy photon impact by measuring the full momentum vector of the recoiling He{sup 1+,2+} ions. For recoil ions following photoabsorption large momenta and a distinct dipole emission pattern are observed. The ions produced by Compton scattering show small momenta. For the ratio of double to single ionization we find (1.22{+-}.06)% at 8.8{sup +1.5}-1.65 keV for Compton scattering and (1.72{+-}.12)% at 7.0{sup +2.1}-1.6 keV for photoabsorption. We compare our data with recent theories.

• OSTI ID: 21156256
• Journal Information: AIP Conference Proceedings, Vol. 360, Issue 1; Conference: 19. international conference on the physics of electronic and atomic collisions, Whistler, BC (Canada), 26 Jul - 1 Aug 1995; Other Information: DOI: 10.1063/1.49792; (c) 1995 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
COMPARATIVE EVALUATIONS
COMPTON EFFECT
DIPOLES
ELECTRON EMISSION
HELIUM IONS
IONIZATION
KEV RANGE
PHOTON-ATOM COLLISIONS
PHOTONS
RECOILS