Absolute cross sections for photoionization of Xeq + ions (1 ≤ q ≤ 5) at the 3d ionization threshold.
- Schippers, S.
- Ricz, S.
- Buhr, T.
- Borovik, A.
- Hellhund, J.
- Holste, K.
- Huber, K.
- Schäfer, H.
- Schury, D.
- Klumpp, S.
- Mertens, K.
- Martins, M.
- Flesch, R.
- Ulrich, G.
- Rühl, E.
- Jahnke, T.
- Lower, J.
- Metz, D.
- Schmidt, L.
- Schöffler, M.
- Williams, J.
- Glaser, L.
- Scholz, F.
- Seltmann, J.
- Viefhaus, J.
- Dorn, A.
- Wolf, A.
- Ullrich, J.
- Müller, A.
DOIAbstract
The photon-ion merged-beams technique has been employed at the new Photon-Ion spectrometer at PETRA III for measuring multiple photoionization of Xeq + (q = 1–5) ions. Total ionization cross sections have been obtained on an absolute scale for the dominant ionization reactions of the type hν + Xeq + → Xer + + (q − r)e− with product charge states q + 2 ≤ r ≤ q + 5. Prominent ionization features are observed in the photon-energy range 650–750 eV, which are associated with excitation or ionization of an inner-shell 3d electron. Single-configuration Dirac–Fock calculations agree quantitatively with the experimental cross sections for non-resonant photoabsorption, but fail to reproduce all details of the measured ionization resonance structures
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