Mainz 2026 – wissenschaftliches Programm
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SYLC: Symposium Light and Chirality: From Fundamentals to Applications
SYLC 1: Light and Chirality: From Fundamentals to Applications
SYLC 1.3: Hauptvortrag
Mittwoch, 4. März 2026, 15:30–16:00, RW 1
Gas-phase spectroscopy of chiral molecules — •Anne Zehnacker1, Etienne Rouquet1,2, Valéria Lepère1, Gustavo Garcia2, and Laurent Nahon2 — 1Institut des Sciences Moléculaires d'Orsay CNRS Université Paris Saclay — 2Synchrotron Soleil
Molecular recognition is strongly influenced by several factors including chirality and molecular flexibility. Chirality indeed modifies the interactions at plays between molecules and flexibility allows them to mutually adapt their shape for optimising the interaction. We will describe here gas-phase studies that are sensitive to both chirality and conformation. In the first part, we will describe conformer-selective laser spectroscopy studies of weakly bound complexes, which allow assessing the influence of chirality of the sub-units on the structure of the complex, to understand the nature of the forces responsible for chiral recognition at the molecular level. The second part will be devoted to photoelectron circular dichroism (PECD). PECD is defined as a forward-backward asymmetry in the photoelectron angular distribution for randomly oriented chiral molecules photo-ionised by circularly polarised light (CPL). Like all the chiroptical spectroscopy methods, it is very sensitive to small differences in the molecular structure, including conformational isomerism. We recently developed a conformer-selective PECD scheme based on resonance-enhanced multiphoton ionisation (REMPI) that allows obtaining separately the PECD of each conformer of a chiral system.
Keywords: Chirality; Photoelectron spectroscopy; Laser spectroscopy; Conformational isomerism; Supersonic expansion