SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Ultrafast Dynamics I (joint session MO/A)
A 9.3: Vortrag
Dienstag, 7. März 2023, 11:45–12:00, F102
Supramolecular dynamics investigated on hydrogen bonded pyrrole-water clusters upon site-specific x-ray photoionization — •Ivo S. Vinklárek1, Hubertus Bromberger1, Wuwei Jin1, Rebecca Boll2, Michael Meyer2, Sebastian Trippel1, and Jochen Küpper1,3,4 — 1Center forFree-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY,Hamburg — 2European XFEL GmbH, Schenefeld — 3Department of Physics, Universität Hamburg — 4Center for Ultrafast Imaging, Universität Hamburg
Solvation of molecules crucially affects their photostability and opens additional pathways for the relaxation dynamics compared to isolated molecules. We intend to get molecular-level insight into the solvation effect in photofragmentation dynamics of a supramolecular system through our molecular beam experiments with stoichiometrically well-defined pyrrole-water (Pyr-H2O) clusters [1]. Concretely, the dissolvation dynamics of the spatially separated pure sample of Pyr-H2O clusters prepared by the electric deflector was investigated through an IR-pump-x-ray-probe experiment. The singly ionizing IR-pulse triggers the (Pyr-H2O)+ fragmentation, which is then site-specifically probed by x-ray free-electron laser pulses [2] at different times of the pyrrole-H2O separation. The study of the hydrogen-bound Pyr-H2O system is especially relevant to abundant pyrrole-containing biomolecules and establishes a novel approach for investigating the key role of intermolecular interactions in supramolecular dynamics.
[1] Johny, M. et al. Chem. Phys. Lett., 2019, 721, 149-152. [2] Onvlee, J. et al., Nat. Commun., in press, arXiv:2103.07171 [physics]