Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 26: Contributions to SYLC II
MO 26.3: Vortrag
Donnerstag, 5. März 2026, 15:15–15:30, P 110
Induced Photoelectron Circular Dichroism onto an Achiral Chromophore — •Etienne Rouquet1,2, Madhusree Roy Chowdhury1, Gustavo Garcia1, Laurent Nahon1, Jennifer Dupont2, Valéria Lepère2, Katia Le Barbu-Debus2, Rodolphe Vuilleumier3, and Anne Zehnacker2 — 1Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, F-91190 St Aubin, France — 2Institut des Sciences Moléculaires d*Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France — 3Chimie Physique et Chimie du vivant (CPCV), École Normale Supérieure, Sorbonne Université, CNRS 75005 Paris, France
For the first time, we recorded induced photoelectron circular dichroism (PECD). More specifically, we formed molecular complexes in the gas phase, separated in two moieties. One part is chiral, but does not have a chromophore, and the other is a non-chiral moiety with a chromophore. We recorded induced PECD of the phenol-methyloxirane (Phe-MOx) complex using VUV synchrotron radiation. The HOMO is localized solely on the phenol moiety and we saw a non-zero chiroptical response originating from the ionization of the complex, which we first assigned to the electron scattering off the chiral molecular potential. We then successfully applied this technique using a ns-laser 2 photon energy scheme, providing conformer-selective PECD data. We confirmed our synchrotron-based results on conformer-selected Phe-MOx molecular complexes, with two structures observed in the gas phase. Hydrogen bonding with both lone pairs of the MOx oxygen atom were involved, revealing a chiral deformation of the phenol.
Keywords: Photoelectron Spectroscopy; Chirality; Synchrotron Radiation; Laser Spectroscopy; Photoelectron Circular Dichroism