Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Poster: Interaction with VUV and X-ray light
A 30.4: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Photofragmentation of Molecular Iodine studied by VIS/XUV- and XUV/XUV-Pump-Probe Measurements at FLASH — •Georg Schmid1, Kirsten Schnorr1, Jakob Kunz1, Arne Senftleben1, Artem Rudenko2, Thomas Pfeifer1, Kristina Meyer1, Theo Zouros3, Joachim Ullrich4, Yuhai Jiang5, Stefan Düsterer6, Claus-Dieter Schröter1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Kansas State University, Manhattan — 3University of Crete, Heraklion — 4PTB, Braunschweig — 5Shanghai Advanced Research Institute, Shanghai — 6DESY, Hamburg
In a pump-probe experiment the photofragmentation of molecular iodine using an ultrashort XUV pulse at ≈ 14 nm delivered by the free-electron-laser facility FLASH and a femtosecond IR laser pulse at ≈ 800 nm was performed. In order to trace the photoionization dynamics as a function of the internuclear distance, the delay between XUV- and IR-pulse is varied. A preceding IR-pulse removes valence electrons and the I2 molecule starts to dissociate which is then probed via the inner-shell absorption of multiple XUV photons. At 14 nm the FEL creates dominantly 4d core holes followed by Auger cascades which results in charge states up to I215+. Thus the interplay between valence- and core-electrons as a function of time is studied. A second time resolved experiment with XUV-pump and XUV-probe allows to investigate core/core electron dynamics.With both schemes we analyze the charge-up behaviour of molecular ions and ionic fragments applying coincident detection of all ion species in a reaction microscope.