Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: MO Poster 1

MO 5.17: Poster

Monday, March 9, 2020, 17:00–19:00, Empore Lichthof

Photoelectron circular dichroism using 1+1 resonance-enhanced multi-photon ionization with UV laser pulses — •Nicolas Ladda, Constantin Witte, Tom Ring, Simon Ranecky, Sudheendran Vasudevan, Alexander Kastner, Han-gyeol Lee, Christian Sarpe, Hendrike Braun, Arne Senftleben, and Thomas Baumert — Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

The forward/backward asymmetry of the photoelectron angular distribution (PAD) with respect to the propagation direction of ionizing circularly polarized light of a randomly orientated chiral molecule is known as photoelectron circular dichroism (PECD). The measurement of the PAD asymmetry can be performed using velocity-map imaging (VMI) technique, where the gas phase provides a nearly collision and interaction free environment. UV fs pulses from fourth harmonic generation (196 nm, 6.3 eV) of our Ti:Sa laser enable a 1+1 resonance-enhanced multi-photon ionization (REMPI) process via energetically higher lying intermediate states of molecules such as fenchone or camphor. In the future, these pulses could also be used to invert the handedness of a chiral molecule by pump-dump-probe experiment, where the UV pulses are required to access an achiral excited state.