Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Highly Excited Molecules and Clusters

MO 10.5: Vortrag

Mittwoch, 8. März 2017, 15:45–16:00, N 6

Multi-state Photoelectron Circular Dichroism in Femtosecond Multiphoton Ionization — •Alexander Kastner, Stefanie Züllighoven, Tom Ring, Cristian Sarpe, 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 was termed Photoelectron Circular Dichroism (PECD) and so far investigated using synchrotron radiation [1, 2]. We observed highly structured asymmetries in the range of +/- 10 % on bicyclic Ketones [3, 4].

Due to the multi photon ionization (MPI), high order Legendre polynomials appear in the measured PADs. In the case of Resonance Enhanced MPI (REMPI) using different intermediate states, the contributions in the photoelectron spectrum depend on wavelength. By changing wavelength and intermediate states, we are able to investigate PECD depending on photoelectron kinetic energy.

[1] I. Powis in S. A. Rice (Ed.): Adv. Chem. Phys. 138, 267-329, (2008)

[2] L. Nahon et al., J. El. Spectr. 204, 322-334, (2015)

[3] C. Lux et al., Chem. Phys. Chem. 16, 115-137, (2015)

[4] A. Kastner et al., Chem. Phys. Chem. 17, 1119-1122, (2016)