Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 1: Ultrafast Structural Dynamics
MO 1.5: Vortrag
Montag, 2. März 2026, 12:45–13:00, P 105
Light-induced wave packet dynamics in sulfur dioxide molecules — •Sanduni Sandeepani Kudagama1,2, Artem Rudenko1, and Huynh Van Sa Lam1 — 1Kansas State University, Manhattan, KS, USA — 2EuXFEL, Schenefeld, Germany
With the development of femtosecond lasers and modern imaging techniques, time-resolves studies of ultrafast light-induced dynamics have become an increasingly important topic in molecular physics and photochemistry. To capture ultrafast molecular dynamics in time domain, femtosecond lasers are often used in a pump-probe scheme. In this study, an intense near-infrared (800 nm) or visible (400 nm) pump pulse was used to trigger wave packet dynamics in neutral and singly charged sulfur dioxide, which were then probed by a second, more intense NIR pulse that further ionized and/or dissociate the molecule. The information on the time evolution of the created molecular wave packets were studied employing momentum-resolved ion spectroscopy and channel-selective Fourier analysis on the delay-dependent yield of several singly, doubly, and triply charged final states of the molecule. All channels were dominated by the ionic ground-state bending vibration, whereas the neutral ground-state bending vibration appeared only with the 800 nm pump as a weak signature in several channels. We incorporated inverse Fast Fourier Transform to reveal the initial direction of the wave packet motion in both ionic and neutral ground states. For either pump pulse used, clear signatures of rotational dynamics were observed. Our study also reveals many important quantum mechanical phenomena such as wave packet dephasing and revivals.
Keywords: Vibrational Dynamics; Rotational Dynamics; Channel Selective Fourier Analysis; Pump-probe experiment; Cold Target Recoil Ion Momentum Spectroscopy