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MO: Fachverband Molekülphysik

MO 3: Chiral Molecules

MO 3.7: Vortrag

Montag, 9. März 2020, 15:45–16:00, f102

Photoelectron circular dichroism via multiphoton ionization with varying pulse duration — •Han-gyeol Lee, Simon Ranecky, Sudheendran Vasudevan, Alexander Kastner, Nicolas Ladda, Tom Ring, Constantin Witte, Hendrike Braun, Daniel Reich, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

Photoelectrons from randomly oriented chiral molecules ionized by circularly polarized light can have an asymmetric momentum distribution with respect to the propagation direction of the laser beam. This effect is called photoelectron circular dichroism (PECD). In this contribution, we studied PECD of a few monoterpenes, such as fenchone, thiofenchone and camphor, by using laser pulses with different time durations from 50 fs to 5 ns. The laser pulses were centered at 380 nm to induce 2+1 resonant-enhanced multiphoton ionization via B- and C-band [1] and photoelectrons from each band were distiguished by different photoelectron energies. As the pulse duration increases, the effect of different relaxation dynamics of B- and C-band were clearly observed as a change of the ratio between photoelectron contributions from B- and C-band. We could model the observed behavior by simplified quantum mechanical model using Lindblad formalism including decoherence.
[1] A. Kastner et al., J. Chem. Phys. 147, 013926, (2017)