Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 27: Poster: Photoionization

A 27.4: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

3d photoionization of ions from the Xe isonuclear sequence — •S Schippers¹, S. Ricz², T. Buhr^1,3, A. Borovik Jr.¹, J. Hellhund¹, K. Holste¹, D. Schury¹, S. Klumpp⁴, K. Mertens⁴, M. Martins⁴, R. Flesch⁵, G. Ulrich⁵, E. Rühl⁵, J. Lower⁶, T. Jahnke⁶, D. Metz⁶, L. Ph. H. Schmidt⁶, M. Schöffler⁶, J. Williams⁶, R. Dörner⁶, L. Glaser⁷, F. Scholz⁷, J. Seltmann⁷, J. Viefhaus⁷, A. Dorn⁸, A. Wolf⁸, J. Ullrich³ und A. Müller¹ — ¹IAMP, Univ. Giessen — ²ATOMKI, Debrecen, Hungary — ³PTB, Braunschweig — ⁴Experimental Physics, Univ. Hamburg — ⁵Physical Chemistry, FU Berlin — ⁶Atomic Physics, Univ. Frankfurt a. M. — ⁷FS-PE, DESY, Hamburg — ⁸MPIK, Heidelberg

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+ → Xe^r+ + (q−r)e⁻ with product charge states q+2≤ r ≤ q+5. Prominent ionization features have been observed in the photon-energy range 650–800 eV, which are associated with excitation or ionization of an inner-shell 3d electron. The well-known collapse of the 4f wave function causes dramatic changes in the spectra when going from low to high q. Corresponding 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.