Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MO: Fachverband Molekülphysik

MO 11: Poster – Chirality

MO 11.7: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

In Situ Circular Dichroism Spectroscopy and Spatial Separation of Chiral Molecules — •Sejun An, Gerard Meijer, and Sandra Eibenberger-Arias — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany

Chirality is a fundamental symmetry property, yet enantiomers remain difficult to distinguish or control. Enantiomer-Specific State Transfer (ESST) provides a powerful route for enantioselective population control by driving a sequence of microwave transitions [1]. Recent advances in 2024 increased the ESST efficiency to 92%, enabling near-complete state-specific enantiomeric enrichment [2].

Here, ESST is extended toward in situ circular dichroism (CD) spectroscopy. Since the population of a quantum state can be enantioselectively controlled, CD measurements can be performed directly on a racemic mixture without switching laser polarization. This enables CD spectroscopy for chiral molecules that cannot be separated into pure enantiomers by conventional methods, and reduces systematic errors associated with polarization switching, thereby improving reproducibility and sensitivity.

Furthermore, ESST will be further advanced by rotational-state-selective ionization, enabling spatial separation of enantiomers. In this approach, the enantioselectively prepared rotational state is ionized, and the resulting ions can be separated by an external electric field.

[1] S. Eibenberger et al. Phys. Rev. Lett. 118, 123002 (2017)

[2] J. H. Lee et al. Nat. Commun. 15, 7441 (2024)

Keywords: Chiral molecule; Circular dichroism spectroscopy; Microwave spectroscopy; Molecular spectroscopy; UV spectroscopy