Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Experimental Techniques and Various Topics
MO 18.2: Vortrag
Mittwoch, 16. März 2011, 16:45–17:00, MER 02
Photoelectron circular dichroism from chiral molecules via multiphoton ionization with femtosecond laser pulses — •Qingqing Liang, Manuel Gerlach, Christian Lux, Jens Köhler, Cristian Sarpe-Tudoran, Matthias Wollenhaupt, and Thomas Baumert — University of Kassel, Institute of Physics and Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany
Using circularly polarized-UV light, a large chiral asymmetry effect in the angular distribution of photoelectron emitted from randomly oriented chiral molecules in gas phase has been obtained experimentally. The technique here relies on a combination of circular dichroism (CD) (which arises from different absorption of left- and right- circularly polarized light by chiral systems) and multiphoton ionization. The asymmetry shows an additional angular distribution in the forward-backward direction (in relation to the propagating direction of the light) compared to the one-photon absorption process induced by synchrotron radiation [1]. The asymmetry reverses while changing the specific handedness of the molecule. The angular distributed asymmetry, defined as 2·(Ilcp(Θ)−Ircp(Θ))/(Ilcp(Θ)+Ircp(Θ)), reaches values lager than 0.2. In addition, time of flight mass spectra are measured under the same conditions.
Powis et al., J. Chem. Phys. 119, 17 (2003))