SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 25: Cluster and Experimental Techniques (joint session MO/A)

A 25.5: Talk

Thursday, March 9, 2023, 15:30–15:45, F142

Femtosecond pump-probe spectroscopy of tetracene in the gas phase and in helium nanodroplets — Audrey Scognamiglio, Nicolas Rendler, •Sebastian Hartweg, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

Acenes, specifically tetracene and pentacene, are promising candidates for applications in organic photovoltaics since ensembles of these molecules can undergo singlet fission to produce two triplet excitations from a single singlet excitation. This process may thus allow to produce multiple charge carriers from a single absorbed photon. The potential applications motivate the fundamental study of the ultrafast excitation dynamics of these molecules and their aggregates to provide a fundamental understanding of the underlying processes and energetics. We will present a study of femtosecond pump-probe photoelectron spectroscopy and mass spectrometry of the excited state dynamics of tetracene excited to its brightest singlet state using UV photons. We will compare results for effusive tetracene with preliminary data for tetracene and its clusters in superfluid helium nanodroplets. The doping of organic molecules into superfluid helium nanodroplets offers a promising path to extend the study from isolated molecules to clusters of acenes, but also imposes additional challenges.