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A: Fachverband Atomphysik

A 4: Clusters I (joint session MO/A)

A 4.8: Vortrag

Montag, 9. März 2020, 13:00–13:15, f102

The role of water in the photophysics of indole — •Lanhai He¹, Melby Johny^{1, 2}, Thomas Kierspel^{1, 2}, Jolijn Onvlee^{1, 2}, Bernd Winter⁴, Sebastian Trippel^{1, 2}, and Jochen Küpper^{1, 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.