Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Interaction with Strong or Short Laser Pulses I (joint session A/MO)

A 17.2: Vortrag

Mittwoch, 12. März 2025, 15:00–15:15, GrHS Mathe

Ionization and Fragmentation of Polyatomic Molecules in Intense Laser Fields using a Reaction Microscope — •Martin Garro, Narayan Kundu, Horst Rottke, Arne Senftleben, and Jochen Mikosch — Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

As attosecond science advances into the study of polyatomic molecules, the many-electron and non-adiabatic phenomena in strong-field ionization (SFI) become relevant. A fundamental question concerns the population of electronically excited states of the cation in the intense field, in particular whether these processes are direct or sequential. We study ionization and fragmentation of polyatomic molecules in intense laser fields experimentally with a Reaction Microscope. Coincidence detection of electron and ion momenta reveal detailed insights into the underlying physics. This presentation highlights our recent work on SFI of 1,3-butadiene, n-butane, and 1-butene, in which the intensities and wavelengths were varied. 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.

Keywords: Reaction Microscope; Strong-Field Ionization; Polyatomic Molecules