Absolute cross sections for photoionization of Xeq+ ions (1 ≤ q ≤ 5) at the 3d ionization threshold

Schippers, S. and Ricz, Sándor and Buhr, T. and Borovik, A. Jr. and Hellhund, J. and Holste, K. and Huber, K. and Schaefer, H. -J. and Schury, D. and Klumpp, S. and Mertens, K. and Martins, M. and Flesch, R. and Ulrich, G. and Ruehl, E. and Jahnke, T. and Lower, J. and Metz, D. and Schmidt, L. P. H. and Schoeffler, M. and Williams, J. B. and Glaser, L. and Scholz, F. and Seltmann, J. and Viefhaus, J. and Dorn, A. and Wolf, A. and Ullrich, J. and Mueller, A. (2014) Absolute cross sections for photoionization of Xeq+ ions (1 ≤ q ≤ 5) at the 3d ionization threshold. JOURNAL OF PHYSICS B: ATOMIC MOLECULAR AND OPTICAL PHYSICS, 47 (11). ISSN 0953-4075

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Abstract

The photon-ion merged-beams technique has been employed at the new Photon- Ion spectrometer at PETRA III (PIPE) 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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