Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 32: Molecular Spectroscopy III
MO 32.3: Talk
Friday, March 6, 2026, 11:45–12:00, P 204
Photoelectron Photoion Multicoincidence Study of Micro-Solvated Bio-Relevant Molecules — •Brendan Wouterlood1, Sitanath Mondal1, Madhusree Roy-Chowdhury2, 3, Gustavo Garcia-Macias2, Laurent Nahon2, Frank Stienkemeier1, and Sebastian Hartweg1 — 1Institute of Physics, University of Freiburg — 2Synchrotron SOLEIL, St. Aubin, France — 3Institute of Physics, University of Kassel
Studying biomolecular building blocks, such as the nucleobase thymine and its precursor, pyridine, in the gas phase allows detailed insights into energetics and dynamics at the molecular level. As in-vivo biomolecular systems exist in the condensed phase, studying complexes of these molecules with water gives greater insight into decay channels that are available in biological systems, while still allowing the application of typical gas phase experimental approaches. One such technique is electron-ion-ion coincidence spectroscopy, which allows for detailed identification of fragmentation pathways that occur at or above the double-ionisation threshold of molecules and complexes. Here, distinguishing different auto-ionisation processes, such as the non-local intermolecular Coulombic decay (ICD) and electron transfer mediated decay (ETMD), as well as the local Auger-Meitner decay is challenging. Identification of these pathways can be helped by the occurrence of intramolecular proton transfer reactions that stabilise complexes with dicationic moeities. Insight into these processes is important to the field of radiation chemistry since the production of low energy electrons can trigger reactions which damage biological material.
Keywords: Photoelectron Photoion Coincidence Spectroscopy; Microsolvation; Nucleobases; Auto-ionisation; Biomolecules