Parts | Days | Selection | Search | Updates | Downloads | Help
MO: Fachverband Molekülphysik
MO 15: Complex Systems in the Gas Phase
MO 15.2: Talk
Wednesday, March 7, 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.
I. Powis, Adv. Chem. Phys. 138, 267-329, (2008)
L. Nahon et al., J. El. Spectr. 204, 322-334, (2015)
C. Lux et al., Chem. Phys. Chem. 16, 115-137, (2015)
A. Kastner et al., Chem. Phys. Chem. 17, 1119-1122, (2016)
A. Kastner et al., J. Chem. Phys. 147, 013926, (2017)