SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster 1
MO 7.4: Poster
Donnerstag, 23. September 2021, 17:30–19:30, P
Probing of a vibrational wave packet in the electronic ground state of methyl p-tolyl sulfoxide via time-resolved photoelectron circular dichroism — •Nicolas Ladda1, Max Waters2, Vít Svoboda2, Mikhail Belozertsov2, Sudheendran Vasudevan1, Simon Ranecky1, Tonio Rosen1, Sagnik Das1, Jayanta Ghosh1, Hangyeol Lee1, Hendrike Braun1, Thomas Baumert1, Hans Jakob Wörner2, and Arne Senftleben1 — 1Institut für Physik, Universität Kassel, 34132 Kassel, Germany — 2Laboratorium für Physikalische Chemie, ETH Zürich, 8093Zürich, Switzerland
The dynamic change of the chiral character upon the laser-induced vibrational motion in the electronic ground state of methyl p-tolyl sulfoxide is investigated. For this purpose, the forward/backward asymmetry of the photoelectron angular distribution (PAD) with respect to the propagation direction of ionising circularly polarised light of the randomly oriented chiral molecule, known as photoelectron circular dichroism (PECD), was measured. Geometry-dependent ionisation rates of a molecule when interacting with an ultrashort laser pulse causes the formation of a coherent oscillating wave packet in the electronic ground state. This phenomenon is called Lochfraß or coordinate-dependent ionisation. The vibrational motion - umbrella motion of the sulfoxide molecule - changes the chiral character of the molecule, which can be studied by probing the time-resolved PECD with a VUV femtosecond laser pulse.