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MO: Fachverband Molekülphysik

MO 8: MO Poster 2

MO 8.9: Poster

Dienstag, 10. März 2020, 17:00–19:00, Empore Lichthof

Photoelectron Circular Dichroism of different monoterpenes and lifetime of their resonances — •Simon Ranecky, Han-gyeol Lee, 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

Short lightpulses of 380 nm are able to ionize monoterpenes like fenchone in a resonant 2+1 multi-photon scheme. The ionisation takes place via resonances in the B- and C-Band [1], which can be distinguished by different photoelectron energies. Depending on the pulse length of the laser, the time for relaxation dynamics changes, leading to a different ratio between the photoelectrons from the B- and C-band. By comparison of this pulse length dependence with a quantum-mechanical model system, we estimate the lifetime of the resonances.

The photoelectrons of randomly oriented chiral molecules ionized with circularly polarized light can have an asymmetric momentum distribution in the direction of the laser beam. This effect is called photoelectron circular dichroism (PECD). It can be found in single photon [2], as well as multi-photon ionisation processes with pulse lengths from femtoseconds [1] to nanoseconds [3].

In this study, we examine fenchone, thiofenchone and camphor with pulselengths from femtoseconds to nanoseconds.

[1] A. Kastner et al., J. Chem. Phys. 147, 013926, (2017)

[2] L. Nahon et al., J. El. Spectr. 204, 322-334, (2018)

[3] A. Kastner et al., Chem. Phys. Chem. 20, 1416-1419 (2019)