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MO: Fachverband Molekülphysik

MO 26: Contributions to SYLC II

MO 26.6: Vortrag

Donnerstag, 5. März 2026, 16:00–16:15, P 110

Optimising enantioselective electronic population transfer in chiral molecules — •Daniel García González and Andrés Ordóñez — Department of Physics, Freie Universität Berlin, Berlin, Germany

Coherent control offers powerful routes to all-optical enantioselective photochemistry. Our approach is based on electronic transitions, requires neither cold molecules nor intermediate resonances nor chiral sensitisers, and is applicable to randomly oriented molecules. Strong (>10%) population differences in opposite enantiomers arise from the interference between two multiphoton excitation pathways driven by a fundamental IR field and two of its harmonics.

In this regime, the population difference takes the form [arXiv:2309.02392v2]

where g⁽⁵⁾ encodes the molecular geometry, while h⁽⁵⁾ depends on the polarizations of the applied fields and is experimentally controllable.

We study the dependence of g⁽⁵⁾ on the molecular structure using the three conformers of carvone, and introduce a strategy to design polarisation schemes that maximise Re[g⁽⁵⁾ · h⁽⁵⁾]. This approach yields experimentally realistic field configurations achieving enantioselective population differences of up to 55% -nearly twice the previously reported 30%- offering a clear, geometry-based method for optimising coherent enantioselective control in electronic transitions.

Keywords: chiral molecules; enantioselective control; coherent control; electronic transitions; ultrafast dynamics