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MO: Fachverband Molekülphysik
MO 26: Contributions to SYLC II
MO 26.1: Hauptvortrag
Donnerstag, 5. März 2026, 14:30–15:00, P 110
Differentiating Between Enantiomers with Nuclear Quadrupole Coupling Using Microwave Three-Wave Mixing — •Freya E. L. Berggötz1,2, Monika Leibscher3, Wenhao Sun1, Christiane P. Koch3, and Melanie Schnell1,4 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany — 3FU Berlin, Fachbereich Physik and Dahlem Center for Complex Quantum Systems, Berlin, Germany — 4Institut für Physikalische Chemie, CAU zu Kiel, Kiel, Germany
We demonstrate the application of microwave three-wave mixing to the amino alcohol valinol, which displays a hyperfine structure in the rotational spectrum due to nuclear quadrupole coupling. The hyperfine structure complicates the typical triad of rotational states, leading to overlapping microwave three-wave mixing cycles. We identified a set of cycles accessible within the hyperfine substructure of the rotational states |JKaKc⟩ = |101⟩, |212⟩, and |202⟩ by applying the selection rules for rotational transitions and nuclear quadrupole coupling. To address an individual cycle of hyperfine transitions or subsets of cycles simultaneously, we explored different pulse schemes exploiting single-frequency or chirped microwave pulses. Each pulse scheme generated a distinct chiral signal, which shows clear enantiomer differentiation. The experimental findings agree very well with numerical simulations using an effective model for the hyperfine interaction. This study thus extends the applicability of microwave three-wave mixing to previously unexplored molecular systems containing quadrupolar nuclei.
Keywords: Microwave three-wave mixing; Chiral molecules; Hyperfine Structure; Spectroscopy