Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 4: Clusters I (joint session MO/A)
A 4.8: Talk
Monday, March 9, 2020, 13:00–13:15, f102
The role of water in the photophysics of indole — •Lanhai He1, Melby Johny1, 2, Thomas Kierspel1, 2, Jolijn Onvlee1, 2, Bernd Winter4, Sebastian Trippel1, 2, and Jochen Küpper1, 2, 3 — 1Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg — 2Center for Ultrafast Imaging, Universität Hamburg — 3Department of Physics, Universität Hamburg — 4Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin
Hydrogen bonds play an important role in biological processes and proteins, e.g., protein folding and molecular recognition. The influence of water in complex systems, such as a protein, can only be explained if the cluster formation and the breaking of the micro-solvated molecular clusters itself is understood. We studied the photo-fragmentation of indole and indole-water1 upon x-ray absorption, which triggers inner-shell ionization from nitrogen and carbon (1s) orbitals. The generated ions and electrons were measured with an angle-resolved coincidence detection scheme, and the results revealed fragmentation-pathway-dependent electron spectra, linking the structural fragmentation dynamics to different electronic excitations. On the other hand, the photoelectron spectrum of an aqueous indole-water solution has been measured through x-ray ionization of indole in a liquid microjet. Analyzing the chemical shifts for the characteristic photoelectron spectra, the hydration of indole in water solutions is about to be identified.