Cross-section ratio of double to single ionization of helium by Compton scattering of 40–100-keV X-rays
- Spielberger, L.
- Bräuning, H.
- Mergel, V.
- Achler, M.
- Weber, Th.
- Khayyat, Kh.
- Burgdörfer, J.
- McGuire, J.
- Schmidt-Böcking, H.
- Muthig, A.
- Tang, J. Z.
- Wang, J.
- Qiu, Y.
- Dörner, R.
- Jagutzki, O.
- Tschentscher, Th.
- Honkimäki, V.
DOIAbstract
We have measured the ratio of cross sections for double to single ionization of helium by Compton scattering, RC=σ++C/σ+C, at photon energies of 40, 80, and 100 keV using cold target recoil-ion momentum spectroscopy. Comparison with calculations involving highly correlated initial states and approximate final states with and without final-state correlations, represented by 3C and 2C wave functions respectively, shows that the influence of final-state correlations persists to very high photon energies. A comparison with recent charged-particle data is made
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