Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Cold Molecules (joint session MO/Q)

Q 23.3: Vortrag

Dienstag, 3. März 2026, 11:45–12:00, P 105

Decoding Feshbach resonances of Ne+HD+ reaction using ion-electron coincidence and merged beam techniques — •Yufeng Wang¹, Arijit Das¹, Baruch Margulis², Karl Horn^1,3, Meenu Upadhyay⁴, Markus Meuwly⁴, Christiane Koch³, and Edvardas Narevicius¹ — ¹Technische Universität Dortmund — ²National Institute of Standards and Technology — ³Freie Universität Berlin — ⁴University of Basel

Feshbach resonance in collisions is an interesting quantum effect. In AMO studies, Feshbach resonance is widely used to produce Feshbach molecules by tuning the magnetic field. In reaction dynamics studies, Feshbach resonances also play a critical role in influencing the scattering cross section. However, this important phenomenon remains unclear to us due to the difficulty of experimental measurement.

Here, we developed a new method to investigate the Feshbach resonance based on ion-electron coincidence measurements, starting with a cold collision that leads to Penning ionization.[1] This new method was applied to research on Feshbach resonances in the Ne and HD+ collision. Assisted by the merged-beam technique, we lowered the collision energy to 22 mK and realized a p-wave (l=1) scattering. Combined with the high-resolution velocity map imaging technique, more substructures were observed and assigned to the Feshbach resonances arising from different vibrational modes of Ne-HD+ by high-accuracy quantum calculations. This work deepens our understanding of the Feshbach resonances in scattering.

(1) Margulis, B. et al. Science 380,77-81(2023).

Keywords: Feshbach resonances; Ion-molecule reaction; cold collision