Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 3: Femtosecond Spectroscopy 1

MO 3.4: Vortrag

Montag, 23. März 2015, 15:30–15:45, PH/HS1

Photoelectron Circular Dichroism from Multiphoton Ionization with Femtosecond Laser Pulses — Christian Lux¹, •Alexander Kastner¹, Stefanie Züllighoven¹, Tom Ring¹, Cristian Sarpe¹, Arne Senftleben¹, 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 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 in above-threshold ionization and enantiomeric purity studies on bicyclic Ketones. A first test on molecular modification on Phenylethanol is demonstrated. The strength of PECD can be determined by quantitative measures [3].
I. Powis in S. A. Rice (Ed.): Adv. Chem. Phys. 138, 267-329 (2008)
C. Lux et al., Angew. Chem. Int. Ed. 51, 5001-5005 (2012)
C. Lux et al., ChemPhysChem, DOI:10.1002/cphc.201402643