Berlin 2014 – wissenschaftliches Programm
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SYPS: Promovierendensymposium
SYPS 2: Velocity map imaging - focusing on intra- and interatomic dynamics 2
SYPS 2.2: Vortrag
Donnerstag, 20. März 2014, 17:00–17:15, Audimax
Quantification of the Photoelectron Circular Dichroism from Multiphoton Ionization with Femtosecond Laser Pulses — •Christian Lux1, Stefanie Züllighoven1, Cristian Sarpe1, Matthias Wollenhaupt2, and Thomas Baumert1 — 1Universität Kassel, Institut für Physik und CINSaT, D–34132 Kassel, Germany — 2Carl von Ossietzky Universität Oldenburg, Institut für Physik, D–26129 Oldenburg, Germany
The asymmetry of photoelectron angular distributions from randomly oriented enantiomers of chiral molecules in the ionization with circularly polarized light arises in forward/backward direction with respect to the light propagation. This effect was termed Photoelectron Circular Dichroism (PECD) and so far investigated using synchrotron radiation [1]. In our recent publication [2] we have demonstrated that PECD is accessible via a Resonance Enhanced Multi-Photon Ionization (REMPI) using femtosecond laser pulses. We observed highly structured asymmetries in the range of ± 10%. Attributed to the MPI high order odd Legendre polynomials appear in the measured PECD. In this talk we show our recent findings on the bicyclic Ketones Camphor, Fenchone and Norcamphor. In order to quantify this data we want to introduce quantitative measures. These measures will be used to distinguish the three bicyclic Ketones and to quantify ellipticity dependences on Camphor as well as the enantiomeric excess in mixtures of R- and S-Fenchone.
[1] I. Powis in S. A. Rice (Ed.): Adv. Chem. Phys. 138, 267-329 (2008)
[2] C. Lux et al., Angew. Chem. Int. Ed. 51, 5001-5005 (2012)