Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Poster: Interaction with VUV and X-ray light
A 24.10: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Time-resolved photofragmentation of molecular iodine at FLASH — •Kirsten Schnorr1, Arne Senftleben1, Thomas Pfeifer1, Artem Rudenko2, Georg Schmid1, Kristina Meyer1, Moritz Kurka1, Yuhai Jiang1, Stefan Düsterer3, Joachim Ullrich1, Claus Dieter Schröter1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Max-Planck Advanced Study Group, Hamburg — 3DESY, Hamburg
A pump-probe experiment on the ultrafast photofragmentation of molecular iodine using an ultra-short 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 molecular dynamics as a function of the internuclear distance, the delay between XUV- and IR-pulse is varied. With a preceding IR-pulse the I2 molecule is dissociated and further ionized via the absorption of multiple XUV photons. We observe charge states up to I215+ due to FEL-created 4d core holes followed by Auger cascades.
All reaction channels resulting in charged fragments can be followed by recoil ion momentum spectroscopy using a reaction microscope.