Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 15: Complex Systems in the Gas Phase

MO 15.2: Vortrag

Mittwoch, 7. März 2018, 14:15–14:30, PA 1.150

Chirality investigated in the gas phase by two-color ionization — •Alexander Kastner, Tom Ring, Roxana Savulea, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany

The asymmetry of photoelectron angular distributions (PADs) 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 is known as photoelectron circular dichroism (PECD) [1, 2]. We observed highly structured asymmetries for resonance enhanced multi-photon ionization (REMPI) in the range of ± 10% on bicyclic Ketones [3, 4] and were able to study dependence on excitation wavelength [5].
Here we report on ionization of noble gas atoms as well as chiral molecules in the gas phase when mixing two colors (400/800 nm) in various relative and total intensity regimes. In the temporal overlap region, the superposition of two colors generates Lissajous-type electric field geometries driving electrons into trajectories not accessible by a single color field. The resulting momentum distributions unravel the imprint of field geometry on photoionization.
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