Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 6: Electronic Spectroscopy II

MO 6.9: Talk

Tuesday, March 10, 2020, 16:00–16:15, f102

Time-resolved soft x-ray photoelectron spectroscopy on 2-thiouracil at FLASH2 — •Dennis Mayer¹, Jan Metje¹, Fabiano Lever¹, Axel Heuer¹, Mario Niebuhr¹, Matthew S. Robinson¹, Skirmantas Alisauskas², Francesca Calegari², Stefan Duesterer², Bastian Manschwetus², Andrea Trabattoni², Tommaso Mazza³, Raimund Feifel⁴, Richard Squibb⁴, Måns Wallner⁴, Thomas J. A. Wolf⁵, and Markus Gühr¹ — ¹University of Potsdam, Germany — ²Deutsches Elektronen-Synchrotron, Hamburg, Germany — ³European XFEL GmbH, Hamburg, Germany — ⁴University of Gothenburg, Sweden — ⁵Stanford PULSE Institute, Menlo Park, USA

Sulfur-substituted nucleobases show an interesting photophysical and photochemical behavior attributed to their efficient relaxation to long living triplet states [1,2].

We performed ultrafast UV pump - x-ray probe spectroscopy at the FLASH 2 free electron laser in Hamburg to monitor the ultrafast relaxation processes of 2-thiouracil into the triplet states. In this talk, we present delay-dependent core level photoelectron and Auger electron spectra taken at and close to the sulfur L-edges. We use the spectra to elucidate the dynamics from an element specific point of view.

We used the newly built URSA-PQ instrument, which is now open for users and compatible with beamlines at FLASH1 and FLASH2 in Hamburg.

[1] Arslancan et al. Molecules 22, 998 (2017)

[2] Ashwood et al. Photochem. Photobiol. 95, 33-58 (2019)