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Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Interaction with VUV and X-ray light I

A 11.5: Vortrag

Montag, 12. März 2012, 18:00–18:15, V47.03

Resonance-Enhanced X-ray Multiple Ionization of Heavy Atoms at LCLS — •Benedikt Rudek1,2, Daniel Rolles1,3, Artem Rudenko1,2, Sang-Kil Son5, Lutz Foucar1,2, Benjamin Erk1,3, Sascha Epp1,3, Robert Hartmann4, Lothar Strüder1,4, Robin Santra5,6, Joachim Ullrich1,3, and the CAMP collaboration5,71Max Planck Advanced Study Group at CFEL, Hamburg — 2MPI für medizinische Forschung, Heidelberg — 3MPI für Kernphysik, Heidelberg — 4MPI Halbleiterlabor, München — 5Center for Free-Electron Laser Science (CFEL), DESY, Hamburg — 6Universität Hamburg — 7LCLS, SLAC, Menlo Park

The interaction of ultra-intense X-rays with rare gas atoms was studied at LCLS, where series of inner shell ionizations yield unprecedentedly high charge states within a single shot. Xenon, in particular, was ionized up to 36+, which requires ionization energies far exceeding the photon energy. Combined experimental and theoretical analysis of ion charge state distributions and simultaneously recorded fluorescence spectra showed that resonant excitations are responsibele for the enhanced ionization. This resonantly enhanced X-ray multi-ionization process (REXMI) is predicted to boost ionization in certain ranges of photon energy and thus enhance radiation damage in the vicinity of heavy atoms.

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