Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 18: Posters 2: Time Resolved Spectroscopy

MO 18.19: Poster

Mittwoch, 13. März 2019, 16:15–18:15, S Foyer LLM

Pulse Length Dependence of Photoelectron Circular Dichroism — Roxana Savulea, •Simon T. Ranecky, Constantin Witte, Alexander Kastner, Tom Ring, Han-gyeol Lee, Sudheendran Vasudevan, Hendrike Braun, Daniel Reich, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

The asymmetry of photoelectron angular distributions from randomly oriented enantiomers of chiral molecules in the ionization with circularly polarized light arises in forward/backward direction with respect to the light propagation direction. This effect is known as photoelectron circular dichroism (PECD) and has been investigated by single-photon [1] as well as resonance-enhanced multi-photon ionization using a femtosecond laser [2, 3]. In that case, ionization occurs out a frozen nuclear configuration. For longer pulses, additional dynamics like internal conversion, intra-molecular vibrational energy redistribution, vibrations or rotation of the molecules come into play.
Here we present a coherent pulse length study to investigate PECD ranging from the femtosecond to the nanosecond regime. To that end, we employ a femtosecond laser with variable pulse duration and a nanosecond dye laser. When using the latter, the lifetime of the intermediate states is much shorter than the pulse duration of the laser.
L. Nahon et al., J. El. Spectr. 204, 322-334, (2015)
C. Lux et al., Chem. Phys. Chem. 16, 115-137, (2015)
A. Kastner et al., J. Chem. Phys. 147, 013926, (2017)