SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Ultrafast Dynamics I (joint session MO/A)
A 9.4: Vortrag
Dienstag, 7. März 2023, 12:00–12:15, F102
Real time tracking of ultrafast dynamics in liquid water — •Gaia Giovannetti1, Ammar bin Wahid1, Sergey Ryabchuk1, Hui-Yuan Chen2, Vincent Wanie1, Andrea Trabattoni1,3, Erik Maansson1, Hugo Marroux4, Majed Chergui2, and Francesca Calegari1,5 — 1Center for Free-Electron Laser Science, DESY, Notkestr. 85, 22607 Hamburg, Germany — 2Ecole Polytechnique Fédérale de Lausanne, Rte Cantonale, 1015 Lausanne, Switzerland — 3Institute of Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 4Laboratoire Interactions, Dynamiques et Lasers, CEA-Saclay, 91191 Gif-sur-Yvette, France — 5The Hamburg Centre for Ultrafast Imaging, Universitaet Hamburg, 22761 Hamburg, Germany
Understanding the properties of water is key to determinate the effects of the liquid environment on the dynamics of biological systems. In our experiment, a 3 fs visible pump impulsively creates a vibrational wave-packet, whose evolution is probed by a time-delayed sub-2 fs UV pulse [1]. As a result of the wave-packet dynamics, the probe signal is modulated in time and the vibrational spectrum can be obtained by a Fourier analysis of the temporal interferogram. A preliminary analysis of our data shows a transient signal whose oscillation period (~11 fs) and decay time (~70 fs) match the values expected for the O-H stretching mode in the ground electronic state of liquid bulk water [2]. Further theoretical insights will allow us to assign specific contributions from the ground, excited and ionized states. [1] Opt. Lett. 44, 1308-1311 (2019) [2] J. Chem. Phys. 135, 244503 (2011).