Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 71: Cavity QED and QED II

Q 71.4: Talk

Friday, March 6, 2026, 11:45–12:00, P 4

Comparison and interference of Photoelectron Circular Dichroism of a chiral molecule induced directly or by Interatomic Coulombic Decay of an antenna atom — •Lara Marie Tomasch, Omar Jesus Franca Santiago, and Stefan Yoshi Buhmann — Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

We aim to examine the photoelectron circular dichroism of a chiral molecule via two different channels: First, the direct ionization of the molecule with circularly polarised light. This is a well-known effect [1]. Alternatively, a non-chiral atom can serve as an antenna atom. This donor atom is first excited by circularly polarised light, the energy is then transfered via resonant Interatomic Coulombic Decay to the chiral acceptor molecule. There is a noticeable change in the resulting signal, depending on which channel is responsible for the ionisation [2].

In an experiment with intermediate distances between atoms and molecules both of these ionization channels can contribute simultaneously. We hence want to focus on possible interference effects and compare this simultaneous coherent process to the two individual processes.

[1]: Ritchie, B., Theory of the angular distribution of photoelectrons ejected from optically active molecules and molecular negative ions. Phys. Rev. A 13, 1411 (1976)

[2]: Buhmann, S. Y. et al, Photoelectron Circular Dichroism of a Chiral Molecule Induced by Resonant Interatomic Coulombic Decay from an Antenna Atom. Phys. Rev. Letters 134, 253001 (2025)

Keywords: PECD; ICD; Chirality