Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 16: Ultrafast Dynamics I

MO 16.3: Talk

Wednesday, March 13, 2024, 15:00–15:15, HS 3044

Investigating the Ultrafast Molecular Relaxation of 4-Thiouracil Using Time-Resolved X-Ray Photoelectron Spectroscopy — •Dennis Mayer¹, David Picconi², Matteo Bonanomi^3,4, Miltcho Danailov⁵, Alexander Demidovich⁵, Michele Devetta⁴, Michele di Fraia⁵, Davide Facciala⁴, Raimund Feifel⁶, Cesare Grazioli⁷, Fabiano Lever¹, Nitsh Pal⁸, Vasilis Petropoulos³, Kevin Prince⁵, Oksana Plekan⁵, Richard Squibb⁶, Caterina Vozzi⁴, Giulio Cerullo^3,4, and Markus Gühr^1,9 — ¹DESY, Hamburg, Germany — ²University of Groningen, The Netherlands — ³Politecnico di Milano, Italy — ⁴CNR-IFN, Milan, Italy — ⁵Elettra-Sincrotrone Trieste, Italy — ⁶University of Gothenburg, Sweden — ⁷CNR-IOM, Trieste, Italy — ⁸Heriot-Watt University, Edinburgh, UK — ⁹University of Hamburg, Germany

Recent experiments on 4-thiouracil observed different time constants for the UV-induced relaxation into its triplet state that go beyond the difference between experiments in the gas and solution phase [1,2]. Utilizing the element- and site-selectivity of x-rays, we studied the relaxation process 4-thiouracil using gas-phase time-resolved x-ray photoelectron spectroscopy (XPS) at the free-electron laser FERMI. Lifetimes of the chemical shifts at the S 2p edge support previous gas-phase experiments [1]. In comparison to its isomer 2-thiouracil [3], the molecule shows an additional excited-state spectral feature.

[1] Chem. Phys. 515, 572 (2018); [2] J. Am. Chem. Soc. 140, 16087-16093 (2018); [3] Nat. Comm. 13, 198 (2022)

Keywords: free-electron laser; ultrafast molecular dynamics; photoelectron spectroscopy; x-rays; thiouracil