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MO: Fachverband Molekülphysik

MO 8: MO Poster 2

MO 8.11: Poster

Dienstag, 10. März 2020, 17:00–19:00, Empore Lichthof

Photoelectron circular dichroism of chalcogene-substituted fenchone molecules using near UV femtosecond laser pulses — •Sudheendran Vasudevan, Han-gyeol Lee, Tom Ring, Simon Ranecky, Constantin Witte, Nicolas Ladda, Hendrike Braun, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

Photoelectron circular dichroism (PECD) is a technique used for sensing molecular chirality with high sensitivity, which arises due to an electric dipole effect [1]. PECD is an asymmetry of the photoelectron emission from a chiral molecule in the forward/backward direction relative to the propagation direction of circularly polarized light field. In this experimental work, we investigate PECD on fenchone molecules where different chalcogene atoms have been substituted in the keto group, e.g. fenchone (oxygen), thiofenchone (sulfur), selenofenchone (selenium). Near ultraviolet laser pulses centred around wavelength of 380 nm, with a pulse duration of around 250 fs and pulse energy of approximately 5 µJ are used to probe these molecules in the gas phase. In the future, a comparative study of the PECD will be done on these molecules by using a wavelength-tunable femtosecond laser source, since PECD is highly dependent on photon energies and energy levels of the molecules [3] which are expected to change by the chemical substitution.
[1] C.Lux et al., Angewandte Chemie 51 (2012): 5001-5005.
[2] C.Lux et al., ChemPhysChem 16 (2015): 115-137.
[3] A.Kastner et al., J. Chem. Phys. 147, 013926 (2017).