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MO: Fachverband Molekülphysik

MO 20: Poster – Molecular Spectroscopy and Dynamics

MO 20.19: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Investigation of the interaction between organic dopants and a helium nanodroplet environment with time-resolved photoelectron spectroscopy — •Leonie Werner, Ulrich Bangert, Sebastian Hartweg, Yilin Li, Arne Morlok, Felix Riedel, Frank Stienkemeier, and Lukas Bruder — University of Freiburg, Institute of Physics, Hermann-Herder-Straße 3, 79104 Freiburg im Breisgau, Germany

Embedding molecules in ultracold helium nanodroplets allows us to study molecular processes in a superfluid environment [1]. Here, we apply time-resolved photoelectron spectroscopy to study the dynamics of dopants embedded in helium nanodroplets. Droplet size-dependent photoelectron spectra [2] have been established as an appropriate technique for studying interactions between organic dopants and the helium environment. Probing helium droplets doped with selected organic molecules, we present a systematic study of the evaporation and ejection dynamics upon laser excitation. Both phenomena have been observed previously in helium nanodroplets for different dopants [1,3,4]. First results will be presented, in particular on ultrafast internal conversion in tetracene.

[1] Toennies, J.P. and Vilesov, A. F. (2004), Angew. Chem.

In. Ed. 43(20): 2622-2648

[2] Loginov. E. et al. (2005), Phys. Rev. Lett. 95(16): 163401

[3] Thaler, B. et al. (2018), Nat. Commun. 9(1): 4006

[4] Meyer. M. et al. (2019), EPJ Web Conf. 205: 06005

Keywords: time-resolved photoelectron spectroscopy; helium nanodroplets; organic molecules; photochemical processes; cluster