Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 11: Photochemistry I
MO 11.2: Talk
Wednesday, March 16, 2022, 10:45–11:00, MO-H7
Multiphoton light-induced potentials — •Matthias Kübel — Institut für Optik und Quantenelektronik, FSU Jena
We study the strong-field photodissociation of H2+ using Cold Target Recoil Ion Momentum Spectroscopy. Our two-color streaking method allows us to produce a coherent wave packet in the molecular cation and expose it to a phase-controlled mid-infrared laser field. The resulting fragmentation pattern exhibits a strikingly structured angular distribution, which depends on various laser parameters. Using two-color Floquet theory as well as numerical solutions of the time-dependent Schrödinger equation, we show that the pattern arises from an interplay of competing multiphoton fragmentation pathways, as well as forced rotational dynamics. On a qualitative level, the dynamics can be intuitively understood by picturing the light-induced potential energy landscape on which the nuclear motion takes place. Interestingly, our expeirmental approach allows us to shape these potentials and follow the ensuing molecular dynamics. Our results highlight the complexity of intense matter interaction even in the simplest of molecules.