Separation of Photoabsorption and Compton Scattering Contributions to He Single and Double Ionization
- Spielberger, L.
- Jagutzki, O.
- Ali, I.
- Bahr, D.
- Schmidt, H. G.
- Frahm, R.
- Schmidt-Böcking, H.
- Dörner, R.
- Ullrich, J.
- Meyer, U.
- Mergel, V.
- Unverzagt, M.
- Damrau, M.
- Vogt, T.
- Khayyat, Kh.
DOIAbstract
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 He1+,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±0.06)% at 8.8+1.5−1.65 keV for Compton scattering and (1.72±0.12)% at 7.0+2.1−1.6 keV for photoabsorption. We compare our data with recent theories
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