Photoabsorption and Compton scattering in ionization of helium at high photon energies [electronic resource].
Published
Arlington, Va. : National Science Foundation (U.S.), 1993. Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Production of singly and doubly charged helium ions by impact of keV photons is studied. The ratio R{sub ph} = σ{sub ph}{sup ++}/σ{sub ph}⁺ for photoabsorption is calculated in the photon-energy range 2--18 keV using correlated initial- and final- state wave functions. Extrapolation towards asymptotic photon energies yields R{sub ph}(ω → ∞) = 1.66% in agreement with previous predictions. Ionization due to Compton scattering, which becomes comparable to photoabsorption above ω ∼ 3 keV, is discussed.
Published through SciTech Connect. 10/01/1993. "conf-930711--12" "DE94000380" 18. international conference on the physics of electronic and atomic collisions,Aarhus (Denmark),21-27 Jul 1993. Burgdoerfer, J.; Andersson, L.R.