Freiburg 2024 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Ultrafast Dynamics I
MO 16.7: Talk
Wednesday, March 13, 2024, 16:00–16:15, HS 3044
Non-adiabatic electronic relaxation of tetracene studied by time-resolved photoelectron spectroscopy — •Sebastian Hartweg1, Audrey Scognamiglio1, Karin S. Thalmann1, Nicolas Rendler1, Aaron Ngai1, Lukas Bruder1, Pedro B. Coto2, Michael Thoss1, and Frank Stienkemeier1 — 1Institute of Physics, University of Freiburg, Germany — 2Materials Physics Center, Spanish National Research Council, Donostia-San Sebastian, Spain
Polycyclic aromatic hydrocarbons are assumed to be important sources of carbon in the interstellar medium. Additionally, some of these species, especially the acenes consisting of linearly-fused benzene units, are promising candidates for organic semiconductor applications. These applications motivate the fundamental study of the ultrafast excitation dynamics of the acenes and their aggregates to provide a fundamental understanding of the underlying processes and energetics.
I will present a femtosecond time-resolved photoelectron spectroscopy study of tetracene molecules supported by high-level ab initio calculations, revealing the ultrafast non-adiabatic dynamics following the excitation to a bright state in the UV range. The stepwise relaxation via an intermediate dark state to a low lying electronic excited state is accompanied by nuclear motion imprinted in the photoelectron spectra by the time-dependent Franck-Condon factors of the delayed photoionization step.
Keywords: Acenes; time-resolved photoelectron spectroscopy; TRPES; non-adiabatic relaxation