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A: Fachverband Atomphysik

A 18: Ultrafast Spectroscopy with XUV (joint session MO/A)

A 18.1: Hauptvortrag

Montag, 5. März 2018, 16:15–16:45, PA 2.150

Measurement of femtosecond dynamics in HCL molecules with THz streaking — Katharina Wenig¹, Marek Wieland¹, Sophie Walther¹, Arne Baumann¹, Anastasios Dimitriou¹, Mark Prandolini¹, Oliver Schepp¹, Ivette Bermundez Maciias², Malte Sumfleth¹, Nikola Stojanovic², Stefan Düsterer², Juliane Röntsch-Schulenburg², Markus Drescher¹, and •Ulrike Frühling¹ — ¹Institut für Experimentalphysik, Universität Hamburg, Deutschland — ²Deutsches Elektrone-Synchrotron DESY, Hamburg, Deutschland

We have studied the ultrafast electronic decay of core excited HCL molecules directly in the time domain. In the experiment we used femtosecond XUV pulses form the free-electron laser in Hamburg (FLASH) to resonantly excite 2p_3/2 core electrons to the antibonding σ^∗ orbital. After the excitation the molecules dissociate and the electronic excitation relaxes via the emission of an Auger-electron. In order to follow the evolution of this coupled electronic and nuclear dynamics we have collinearly superimposed the exciting XUV pulses with intense THz pulses from the FLASH THz undulator. Electrons emitted from the molecules are accelerated (streaked) by the THz electric field whereby the resulting momentum change depends on the THz phase at the ionization time. Thus the ionization dynamics can be studied by measuring the streaked electron spectra. In the talk the experimental technique and first experimental results will be presented.