Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Poster – Chirality

MO 11.6: Poster

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

Towards measuring the circular dichroism in the ion yield of selenofenchone via tailored femtosecond laser pulses — •Krishna Kant Singh, Sagnik Das, Nicolas Ladda, Sudheendran Vasudevan, Tonio Rosen, Fabian Westmeier, Arne Senftleben, Jochen Mikosch, Thomas Baumert, and Hendrike Braun — Institut für Physik, Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany

Circular Dichroism (CD) is a powerful method for distinguishing enantiomers through their differential absorption of left- and right-circularly polarized light. This asymmetry can also manifest in their ionization yields, known as CD in ion yield (CDIY). We investigate this using our home-built Time-of-Flight mass spectrometer in a twin-peak measurement setup [1] to study how linear chirp influences the anisotropy [2]. The π* * n transition in selenofenchone is red-shifted into the visible region (550*600 nm) and liquid-phase measurements indicate a pronounced CD effect. This makes the molecule particularly appealing for investigating CDIY, as technological controlling CDIY processes via tailored light fields is more readily achieved in the infrared or visible range. [1] T. Ring, et. al. Rev. Sci. Instrum., 2021, 92, 033001 [2] S. Das et. al., Phys. Chem. Chem. Phys., 2025, 27, 8043-8051