Rostock 2019 – scientific programme
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MO: Fachverband Molekülphysik
MO 18: Posters 2: Time Resolved Spectroscopy
MO 18.20: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Foyer LLM
Role of coherence for photoelectron circular dichroism after multi-photon excitation in randomly oriented chiral molecules — •Alexander Blech1, R. Esteban Goetz1, Timur A. Isaev2, Behnam Nikoobakht2, Robert Berger2, and Chrisitane P. Koch1 — 1Universität Kassel, Deutschland — 2Philipps-Universität Marburg, Deutschland
Photoelectron circular dichroism (PECD) refers to the forward/backward asymmetry in the photoelectron angular distribution with respect to the propagation axis of circularly polarized light. Our existing model for PECD in resonantly enhanced multi-photon ionisation of randomly oriented chiral molecules is based on perturbation theory for the light-matter interaction and on ab initio calculations for the multi-photon absorption, giving semi-quantitative agreement with experimental data for fenchone and camphor and enabling application of coherent control.
Here we want to extend this model to explicitly take into account the chirality of the photoelectron continuum and the coherence between non-resonant multi-photon excitation and one-photon ionisation by standard quantum beat spectroscopy of electronic superposition states in a pump-probe scheme. Our extended model will allow us to distinguish the contributions of intermediate and final states to PECD and to refine our quantum optimal control approach in order to determine the ultimate strength of the chiral response.