Mainz 2026 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 5: Optical Methods
K 5.4: Vortrag
Donnerstag, 5. März 2026, 12:00–12:15, HS 20
Real-time tracking of the intramolecular vibrational dynamics of liquid water — Gaia Giovannetti1, Sergey Ryabchuk1,2, Ammar Bin Wahid1, Hui-Yuan Chen3, Giovanni Batignani4, Erik P. Månsson1, •Oliviero Cannelli1, Emanuele Mai4, Andrea Trabattoni1,5, Ofer Neufeld6, Angel Rubio1,7, Vincent Wanie1, Hugo Marroux8, Tullio Scopigno4, Majed Chergui3,9, and Francesca Calegari1,2,10 — 1CFEL, DESY, Hamburg, Germany — 2CUI, Hamburg, Germany — 3LACUS, EPFL, Lausanne, Switzerland — 4Università di Roma La Sapienza, Roma, Italy — 5Leibniz Universität Hannover, Germany — 6Technion Israel Institute of Technology, Haifa, Israel — 7MPSD, Hamburg, Germany — 8CEA-Saclay, Gif-sur-Yvette, France — 9Elettra, Trieste, Italy — 10Universität Hamburg, Hamburg, Germany
Water's vibrational motions, occurring on a few-femtosecond timescale, govern ultrafast energy transfer within its hydrogen-bond network. However, direct real-time observation of these motions has remained elusive due to the extreme temporal resolution required. Here, we investigate the ground-state vibrational dynamics of liquid water initiated by a sub-5 fs near-infrared pump pulse via Impulsive Stimulated Raman Scattering. Using few-fs ultraviolet probe pulses transmitted through a 5 um-thick liquid jet, we monitor the coherent vibrational wave packet dominated by the OH stretch mode, exhibiting a 10 fs oscillation period and a 25 fs damping time. These results reveal the rapid dephasing of the OH stretch mode preceding its relaxation through coupling to the bending vibrations.
Keywords: water; Impulsive stimulated Raman scattering; few-fs pump-probe; liquid jet