SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Molecules in Intense Fields and Quantum Control (joint session MO/A)
A 16.2: Vortrag
Mittwoch, 8. März 2023, 15:00–15:15, F102
Pulse length dependence of photoelectron circular dichroism — •Hangyeol Lee1, Simon Ranecky1, Sudheendran Vasudevan1, Nicolas Ladda1, Tonio Rosen1, Sagnik Das1, Jayanta Ghosh1, Hendrike Braun1, Daniel Reich2, Arne Senftleben1, and Thomas Baumert1 — 1Institut für Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany.
We studied the dependence of photoelectron circular dichroism (PECD) of fenchone on the duration of ionizing laser pulses from 30 fs to 5 ns. The laser pulses were centered at 380 nm to induce 2+1 resonant-enhanced multiphoton ionization of fenchone via 3s and 3p intermediate states. The photoelectrons from each intermediate state were distinguished by their different kinetic energies. As the pulse duration increases, the effect of relaxation dynamics was observed as a change in the ratio of photoelectron contributions from the 3s and the 3p intermediate states. The PECD measured via the 3s intermediate resonance was about 15 % and robust despite ongoing molecular dynamics such as rotation, vibration, and internal conversion. We simulated the observed relaxation dynamics using a simplified model system and estimated the lifetimes of the intermediate states.