Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Poster: Molecules in Strong Fields
MO 22.6: Poster
Donnerstag, 14. März 2024, 17:00–19:00, Tent C
Time-resolved measurement of laser-induced dissociation of the argon dimer cation with a two-color pump-probe scheme — •Bo Ying1,2,3, Giorgio Visentin2,3, Matthias Kübel1,2, Stephan Fritzsche2,3,4, and Gerhard G Paulus1,2,3 — 1Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 4Institute for Theoretical Physics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
We present the time-resolved measurements of the photodissociation dynamics in the argon dimer cation Ar2+, utilizing a pump-probe technique involving two different colors. In the experiment, the first laser pulse dissociates the generated Ar2+ ions, and the consequent dynamics are probed by a time-delayed second pulse. In contrast to the previous measurements of the simplest molecular ion H2+, the delay-dependent kinetic energy distribution of the fragments not only shows the breakage of Ar2+ on the femtosecond time scale, but also reveals some intriguing features. Calculations of the potential energy curves of Ar2+ and Ar2 help to understand the origin of such features, which results from the inherent multielectron nature of these heavy ions. This capability paves the way to investigate the temporal dynamics of hitherto unexplored molecular ion targets.
Keywords: argon dimer cation; laser-induced dissociation; pump probe; two-color field