Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 6: Femtosecond Spectroscopy I

MO 6.2: Talk

Monday, March 12, 2012, 16:45–17:00, V38.03

Circular Dichroism in the Photoelectron Angular Distributions of Camphor and Fenchone observed via Multiphoton Ionization — •Christian Lux, Tom Bolze, Cristian Sarpe, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

Photoelectron Circular Dichroism (PECD) [1] was investigated the last decade on small chiral molecules using vacuum ultraviolet (VUV) synchrotron radiation. The observed asymmetries in PECD arise in forward/backward direction with respect to the light propagation and show an effect several orders larger than in conventionally observed CD. Resonance Enhanced Multi-Photon Ionization (REMPI) in mass spectroscopy of chiral molecules using ultrashort laser pulses [2,3] in the visible and near UV showed also strong asymmetries in the absorption of circularly polarized light.
In this contribution we present that PECD is also accessible using REMPI with UV femtosecond laser pulses [4]. The obtained Photoelectron Angular Distributions in the 2+1 REMPI of Camphor and Fenchone contain highly structured asymmetries up to 20%.
[1] I. Powis in S. A. Rice (Ed.): Adv. Chem. Phys. 138, 267-329 (2008)
[2] C. Logé, A. Bornschlegl, U. Boesl, Anal. Bioanal. Chem. 395, 1631-1639 (2009)
[3] P. Horsch, G. Urbasch, K.-M. Weitzel, Z. Phys. Chem. 225, 587-594 (2011)
[4] C. Lux, M. Wollenhaupt, T. Bolze, Q. Liang, C. Sarpe, T. Baumert (in preparation) (2011)