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A: Fachverband Atomphysik

A 45: Velocity map imaging - focusing on intra- and interatomic dynamics SYPS 2 (with jDPG)

A 45.2: 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)