Bonn 2025 – scientific programme
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MO: Fachverband Molekülphysik
MO 21: Poster – Interaction with Strong or Short Laser Pulses (joint session A/MO)
MO 21.4: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Strong-Field Ionization and Laser-Driven Electron Recollision of Molecules studied in a Reaction Microscope — •Narayan Kundu1, Martin Garro1, Janko Janko Umbach1, Horst Rottke1, Tobias Witting2, Arne Senftleben1, and Jochen Mikosch1 — 1Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany — 2Ultrafast XUV-Physics, Max Born Institute (MBI), Max-Born-Straße 2A, 12489 Berlin, Germany
Reaction microscopes (REMIs) are among the most powerful spectrometers in experimental AMO physics. In a REMI, the momentum of multiple electrons and ions resulting from an event can be measured in coincidence. Here we present experiments on isolated molecules, which are ionized with an intense, femtosecond laser field. In current work on Strong-Field Ionization of 1,3-butadiene, n-butane, and 1-butene molecules, we varied intensities and wavelengths. We observe qualitative changes of experimental observables as a function of these parameters, which we interpret as transition between non-sequential and sequential excitation processes in the intense field. We also present our progress towards using Strong-Field Ionization as a probe mechanism for molecular dynamics and on laser-driven elastic rescattering in a chiral molecule. Furthermore, we have set up a post-compression scheme to significantly reduce the pulse duration of the laser pulses from our commercial regenerative amplifier, based on a gas-filled hollow-core fiber with pressure gradient and chirped mirrors.
Keywords: Reaction Microscope; Strong-Field Ionization; LIED; Chiral molecules