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MO: Fachverband Molekülphysik

MO 2: X-ray FELs (joint session MO/A)

MO 2.1: Vortrag

Montag, 14. März 2022, 14:00–14:15, MO-H5

Following excited-state chemical shifts in molecular ultrafast x-ray photoelectron spectroscopy — •Dennis Mayer¹, Fabiano Lever¹, David Picconi¹, Jan Metje¹, Skirmantas Alisauskas², Francesca Calegari³, Stefan Düsterer², Christopher Ehlert⁴, Raimund Feiffel⁵, Mario Niebuhr¹, Bastian Manschwetus², Marion Kuhlmann², Tomaso Mazza⁶, Matthew S. Robinson^1,3, Richard J. Squibb⁵, Andrea Trabattoni³, Mans Wallner⁵, Peter Saalfrank¹, Thomas J.A. Wolf⁷, and Markus Gühr¹ — ¹University of Potsdam, Germany — ²DESY, Hamburg, Germany — ³CFEL, Hamburg, Germany — ⁴HITS gGmbH, Heidelberg, Germany — ⁵University of Gothenburg, Sweden — ⁶European XFEL GmbH, Hamburg, Germany — ⁷Stanford PULSE Institute, Menlo Park, USA

We demonstrate the capabilities of time-resolved x-ray photoelectron spectroscopy with a study of the UV-excited dynamics of 2-thiouracil conducted at the FLASH free electron laser in Hamburg, Germany. By probing sulfur 2p core electrons, we discover that a significant part of the excited-state population relaxes to the ground state within 220-250fs. Observed spectral shifts can be directly attributed to a charge redistribution over the molecule during the relaxation process. Additionally, we observe a 250fs oscillation in the kinetic energy of the excited-state population which reveals a coherent population exchange among electronic states.