Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Poster – Chirality

MO 10.2: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Towards the measurement of Photoelectron Circular Dichroism of (M)-[4] triangulane — •Tonio Rosen, Nicolas Ladda, Simon Ranecky, Sagnik Das, Sudheendran Vasudevan, Till Stehling, Fabian Westmeier, Jochen Mikosch, Krishna Singh, Hendrike Braun, Arne Senftleben, and Thomas Baumert — Universität Kassel

[n] Triangulanes are helically chiral molecules with structural helicity, providing a chiral scattering potential for electrons upon photoionization and a helical electron distribution in its highest occupied molecular orbital [1]. Hence, these molecules are promising for investigating photoelectron circular dichroism (PECD) after resonance-enhanced multiphoton ionization in the gas phase. PECD is defined as a forward-backward asymmetry in photoelectron distribution with respect to the laser propagation direction in chiral molecules ionized with circularly polarized light [2]. Using a velocity map imaging spectrometer, we aim to investigate the PECD of the smallest chiral triangulane, the [4] triangulane, in the 200- to 800 nm range. To this end, we want to employ gas chromatography, separating the enantiomers of a racemic mixture before their introduction into the experimental chamber. In this contribution, we will present the recent progress of this project. [1] A. de Meijere et Al., The First Enantiomerically Pure [n]Triangulanes and Analogues: σ-[n]Helicenes with Remarkable Features. Chem. Eur. J. 8. [2] C. Lux et Al., Circular dichroism in the photoelectron angular distributions of camphor and fenchone from multiphoton ionization with femtosecond laser pulses. Angew. Chem. Int. Ed. 51.

Keywords: PECD; Chirality; REMPI