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MO: Fachverband Molekülphysik
MO 13: Posters 1: Ultrafast Spectroscopy
MO 13.21: Poster
Dienstag, 6. März 2018, 16:15–18:15, Orangerie
Ultrafast electronic delay of core excited HCl molecules measured with THz streaking — •Katharina Wenig1, Marek Wieland1, Sophie Walther1, Arne Baumann1, Anatasios Dimitriou1, Mark Prandolini1, Oliver Schepp1, Ivette Bermúdez Maciias2, Malte Sumfleth1, Nikola Stojanovic2, Stefan Düsterer2, Juliane Röntsch-Schulenburg2, Markus Drescher1, and Ulrike Frühling1 — 1Institut für Experimentalphysik, Universität Hamburg, Deutschland — 2Deutsches Elektron-Synchrotron DESY, Hamburg, Deutschland
We have resonantly excited 2p3/2 core electrons from HCl molecules to the antibonding σ* orbital using femtosecond soft-x-ray pulses from the free-electron laser in Hamburg (FLASH). After the excitation the molecules dissociate and the electronic excitation relaxes via the emission of an Auger-electron. Both processes compete on similar ultrashort femtosecond time scales. In order to follow the evolution of this coupled electronic and nuclear dynamics, we equipped x-ray electron spectroscopy with time resolution.
In our experiment the exciting soft-x-ray pulses were collinearly superimposed 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 instant of ionization.The experimental setup and first experimental results will be presented.