Mainz 2026 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 32: Molecular Spectroscopy III

MO 32.1: Hauptvortrag

Freitag, 6. März 2026, 11:00–11:30, P 204

Time-resolved photoelectron spectroscopy of polycyclic hydrocarbons in rare-gas clusters — •Leonie Werner, Ulrich Bangert, Sebastian Hartweg, Yilin Li, Arne Morlok, Felix Riedel, Frank Stienkemeier, and Lukas Bruder — Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany

Time-resolved photoelectron spectroscopy (TRPES) is a powerful tool for probing ultrafast molecular dynamics, yet its application to molecules embedded in condensed environments remains challenging. We address this by studying polycyclic aromatic hydrocarbons (PAHs) dissolved in liquid-helium and solid-argon clusters, enabling controlled variations of environmental interactions. Despite the surrounding medium, we achieve high energy resolution and resolve environment-dependent differences in the molecular dynamics. In a first demonstration, we investigated the ultraviolet-induced ultrafast internal conversion in tetracene which is building on our previous work on isolated tetracene molecules in the gas phase [1]. In the next step, we intend to extend this to a systematic study of various acene molecules.

[1] A. Scognamiglio et al., J. Chem. Phys. (2024), 161, 024302

Keywords: time-resolved photoelectron spectroscopy; helium nanodroplets; organic molecules; polycyclic hydrocarbons; cluster