Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: X-ray Spectroscopy
MO 11.7: Vortrag
Mittwoch, 13. März 2024, 12:30–12:45, HS 3044
Solvated pyrimidine molecules as donor or acceptor of X-ray induced intermolecular energy transfer — •Dana Bloß1, Florian Trinter2,3, Nikolai V. Kryzhevoi4, Alexander Kuleff4, Lorenz S. Cederbaum4, Arno Ehresmann1, and Andreas Hans1 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 3Institut für Kernphysik, Goethe- University, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 4Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
We investigated the effect of the presence of an aqueous environment for small bio-relevant organic molecules after their exposure to X-ray irradiation in a photoelectron-ion-ion coincidence experiment performed at the P04 beamline of PETRA III. In the decay of electronic inner-shell vacancies located in the solvated pyrimidine itself or in the water environment of the molecule we found evidence for intermolecular energy transfer in both directions. These processes can protect the molecule from reaching dicationic states via Auger decay and their inevitable fragmentation. The observations are compared with the results of theoretical calculations for a deeper understanding of the occurring effects.
Keywords: Intermolecular energy transfer; Photoelectron-ion-ion coincidence; Pyrimidine; Water cluster; Solvated biomolecule