Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 20: Poster – Molecular Spectroscopy and Dynamics

MO 20.8: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Time-resolved Imaging of CH4 Fragmentation in Strong Laser Fields — •Nikolas Rapp, Weiyu Zhang, Thomas Pfeifer, and Robert Moshammer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

With a Reaction Microscope (ReMi) [1] the ionization and dissociation dynamics of methane in strong laser fields were studied in a series of pump-probe experiments. For the creation of temporally separated laser pulses and pulse shaping a spatial light modulator (SLM) was used. It allows the control of laser pulses in terms of amplitude, polarization, and phase [2, 3]. By employing the SLM technique, we successfully compressed the laser pulses to below 10 fs and achieved a precise control over the time-delay between the two pulses. Upon strong-field ionization the molecule undergoes fragmentation and Coulomb explosion (CE) and the corresponding charged fragments are collected with the ReMi. For example, in the case of CE the initial inter-nuclear distances can be determined via the measurement of final kinetic energies, and in pump-probe measurements the evolution of the molecular geometry is visualized as function of time. Selected results will be presented and discussed.

References:

[1] J. Ullrich et al.,2003, Rep. Prog. Phys. 66, 1463-1545

[2] Stefanie Kerbstadt, 2016, MA thesis. Universität Oldenburg

[3] T Brixner and G Gerber, 2001, Opt. Lett. 26,557-559

Keywords: Strong-field ionization; Reaction Microscope; Coulomb explosion; pulse shaping