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MO: Fachverband Molekülphysik

MO 11: Poster – Chirality

MO 11.5: Poster

Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG

Coherent Control of a chirality-modifying vibrational wave packet — •Nicolas Ladda, Fabian Westmeier, Tonio Rosen, Sudheendran Vasudevan, Simon Ranecky, Sagnik Das, Krishna Singh, Hendrike Braun, Jochen Mikosch, Thomas Baumert, and Arne Senftleben — Institute of Physics and CINSaT, University of Kassel, 34132 Kassel, Germany

Converting an enantiomer into the other configuration via an electronically excited state has recently been observed on the femtosecond timescale. Here, we want to present a coherent control scheme of the vibrational wave packet that is causing this transformation. A so-called pump-dump scheme is achieved by splitting the pump pulse into two parts and delaying one of them with a Mach-Zehnder interferometer. This allows for stopping the motion of the created wave packet by the pump pulse with the dump pulse at the desired delay. This results in the conversion of the enantiomer into its mirror configuration via the excited state [1] and subsequent fixation by deexcitation to the ground state. The process is studied by time-resolved photoelectron circular dichroism in the gas phase, providing an interaction-free environment and a large chiral observable [2].

[1] W. Sun, I. Kleiner, A. Senftleben, M. Schnell, J. Chem. Phys. 2022, 156, 15, 154304.

[2] N. Böwering, T. Lischke, B. Schmidtke, N. Müller, T. Khalil, U. Heinzmann, Phys. Rev. Lett. 2001, 86, 1187

Keywords: Chirality; Femtosecond Laser Pulses; Coherent Control