Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Chirality I
MO 2.1: Hauptvortrag
Montag, 2. März 2026, 11:30–12:00, P 110
Charge-directed reactivity in chiral molecules induced by ultrafast co-rotating currents — •Aurelien Sanchez1,2,3, Erik Månsson1, Vincent Wanie1, Olga Smirnova4,5, Valerie Blanchet6, Yann Mairesse6, Bernard Pons6, and Francesca Calegari1,2,3 — 1Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Germany — 3Physics Department, Universität Hamburg, Germany — 4Max-Born-Institut, Berlin, Germany — 5Technische Universität Berlin, Germany — 6Université de Bordeaux - CNRS - CEA, CELIA, France
Geometrical phase effects [1] (or the Berry phase [2]) play crucial roles in chemical reactions [3]. Recently, direct evidence of topological effects has been observed in small, isolated chiral structures [4, 5], supported by theoretical work within the electric dipole approximation [6]. One such technique relies on the ability to control chiroptical properties using broadband, short UV pulses to enhance or suppress the anisotropy parameter of a given molecular enantiomer. Here, we extend this method to measure the forward/backward asymmetry of fragments produced by dissociation following ionisation of the neutral excited parent molecule. In doing so, we obtain clean snapshots of the different ion fragments from a particular molecular enantiomer using velocity map imaging (VMI) in combination with short UV pump pulses (FTL 2.1 fs) and near-infrared circularly polarised light (FTL 4.0 fs). At specific delays, we observe a 20 to 30% asymmetry, thereby demonstrating a method for charge-directed reactivity in chiral molecules.
Keywords: molecular imaging; charge-directed reactivity; rydberg states excitation