Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 18: Ultrafast Spectroscopy with XUV (joint session MO/A)
A 18.1: Invited Talk
Monday, March 5, 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 2p3/2 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.