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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.30: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1

XUV-pump---XUV-probe transient absorption experiments in small halogenated hydrocarbons — •Marc Rebholz¹, Thomas Ding¹, Maximilian Hartmann¹, Lennart Aufleger¹, Alexander Magunia¹, David Wachs¹, Veit Stooß¹, Paul Birk¹, Gergana Borisova¹, Kristina Meyer¹, Andrew Attar², Thomas Gaumnitz³, Zhi Heng Loh⁴, Sebastian Roling⁵, Marco Butz⁵, Helmut Zacharias⁵, Stefan Düsterer⁶, Christian Ott¹, and Thomas Pfeifer¹ — ¹MPI für Kernphysik, Heidelberg, Germany — ²UC Berkeley, Berkeley, USA — ³ETHZ, Zürich, Switzerland — ⁴NTU Singapore, Singapore — ⁵WWU Münster, Münster, Germany — ⁶DESY, Hamburg, Germany

We present preliminary results of an XUV-pump-XUV-probe transient absorption experiment at the free-electron laser FLASH in Hamburg. The goal of our experiment is to determine how charge-rearrangement dynamics influence the dissociation of a molecule. In the experiments, we used small halogenated hydrocarbon molecules containing two iodine sites. We resonantly excited the 4d -> σ* transition with the first XUV pulse. This induces a breaking of one C-I bond. Shortly thereafter the exact same transition was probed with the second XUV pulse to investigate how the modified electronic environment can be accessed via the absorption spectrum of the dissociating molecule. To drive the experimental scheme the XUV pulses were split into two identical copies and the time delay between them was varied from -1 ps to +3 ps. In addition, we varied the intensity of the FEL pulses by attenuating the full beam with a nitrogen gas absorber.