Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.10: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Photoelectron Circular Dichroism in the Above-Threshold-Ionization of Bicyclic Ketones observed via Femtosecond Laser Ionization — Christian Lux, Vanessa Brandenstein, •Tom Ring, Jens Köhler, Cristian Sarpe, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

Photoelectron Circular Dichroism (PECD) so far investigated using synchrotron radiation on chiral molecules shows asymmetries in forward/backward direction with respect to the light propagation. The effects observed are several orders of magnitude larger than in conventionally CD [1]. Resonance Enhanced Multi-Photon Ionization (REMPI) in mass spectrometry of chiral molecules using laser pulses results in strong asymmetries in the absorption of circularly polarized light [2,3]. We demonstrated that PECD is also accessible via REMPI on chiral molecules using femtosecond laser pulses, containing highly structured asymmetries up to ± 15% [4]. In this poster we show that PECD also appears in the Above-Threshold-Ionization on the bicyclic ketones Camphor, Norcamphor and Fenchone. We observe contributions of higher order Legendre polynomials in the angular distributions as compared to the threshold ionization.
[1] I. Powis in S. A. Rice (Ed.): Adv. Chem. Phys. 138, 267-329 (2008)
[2] C. Logé, U. Boesl, Chem. Phys. Chem. 12, 1940-1947 (2011)
[3] P. Horsch, G. Urbasch, K.-M. Weitzel, Chirality 24, 684-690 (2012)
[4] C. Lux et al., Angew. Chem. Int. Ed. 51, 5001-5005 (2012)