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arXiv · 1404.3021

Absolute cross sections for photoionization of Xe$^{q+}$ ions (1 $\le$ q $\le$ 5) at the 3d ionization threshold

S. Schippers·S. Ricz·T. Buhr·A. Borovik Jr.·J. Hellhund·K. Holste·K. Huber·H. -J. Schäfer·D. Schury·S. Klumpp·K. Mertens·M. Martins·R. Flesch·G. Ulrich·E. Rühl·T. Jahnke·J. Lower·D. Metz·L. P. H. Schmidt·M. Schöffler·J. B. Williams·L. Glaser·F. Scholz·J. Seltmann·J. Viefhaus·A. Dorn·A. Wolf·J. Ullrich·A. Müller
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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 Xe$^{q+}$ (q=1-5) ions. Total ionization cross sections have been obtained on an absolute scale for the dominant ionization reactions of the type hν+ Xe$^{q+}$ $\to$ Xe$^{r+}$ + (q-r) e$^-$ with product charge states q+2 $\le$ r $\le$ 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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S. Schippers, S. Ricz, T. Buhr, A. Borovik Jr., J. Hellhund, K. Holste, K. Huber, H. -J. Schäfer, D. Schury, S. Klumpp, K. Mertens, M. Martins, R. Flesch, G. Ulrich, E. Rühl, T. Jahnke, J. Lower, D. Metz, L. P. H. Schmidt, M. Schöffler, J. B. Williams, L. Glaser, F. Scholz, J. Seltmann, J. Viefhaus, A. Dorn, A. Wolf, J. Ullrich, A. Müller. 2014-04-11. Absolute cross sections for photoionization of Xe$^{q+}$ ions (1 $\le$ q $\le$ 5) at the 3d ionization threshold. https://doi.org/10.1088/0953-4075%2F47%2F11%2F115602

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