Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster: Interaction with VUV and X-ray light II

A 28.11: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Electron Rearrangement Dynamics in Dissociating I2n+ Molecules Accessed by XUV Pump-Probe Experiments — •Kirsten Schnorr1, Arne Senftleben1, Moritz Kurka1, Georg Schmid1, Sven Augustin1, Yifan Liu1, Thomas Pfeifer1, Artem Rudenko2, Kristina Meyer1, Matthias Kübel3, Matthias Kling3, Björn Siemer4, Michael Wöstmann4, Helmut Zacharias4, Stefan Düsterer5, Rolf Treusch5, Joachim Ullrich6, Claus-Dieter Schröter1, and Robert Moshammer11Max-Planck-Institut für Kernphysik, Heidelberg — 2J.R. Macdonald Laboratory, Kansas State University — 3Max-Planck-Institut für Quantenoptik, Garching — 4Westfälische Wilhelms-Universität, Münster — 5Deutsches Elektronen-Synchrotron, Hamburg — 6Physikalisch-Technische Bundesanstalt, Braunschweig

The dynamics of dissociating multiply charged iodine molecules, I2n+, is induced and probed by intense XUV pulses delivered by the free-electron laser in Hamburg (FLASH). A first pulse multiply ionizes I2 and thereby triggers the fragmentation of the molecule. During the dissociation a probe pulse further ionizes the fragments after an adjustable time-delay. Depending on the internuclear distance the probe pulse may or may not initiate electron transfer between the ions. By detecting the charge states of coincident ion pairs as a function of the pump-probe delay, we determine the critical separation and time scales up to which electron transfer along the internuclear axis takes place. These scales are important for understanding the radiation damage occurring in X-ray single-molecule imaging.

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