Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Cold Molecules (joint session MO/Q)
MO 8.5: Vortrag
Dienstag, 3. März 2026, 12:15–12:30, P 105
Colder collisions for cleaner tomography of Feshbach resonances between atoms and molecules — •Karl P. Horn1,2, Arijit Das1, Yufeng Wang1, Julia Narevicius1,4, Meenu Upadhyay3, Baruch Margulis4, Daniel M. Reich2, Markus Meuwly3, Christiane P. Koch2, and Edvardas Narevicius1,4 — 1Technische Universität Dortmund — 2Freie Universität Berlin — 3University of Basel — 4Weizmann Institute of Science
Fundamental quantum effects are investigated at the interface between theory and experiment. Foremost amongst these are Feshbach resonances - observed, for instance, in collisions between rare gas atoms and a dihydrogen molecule ions (and their isotopomers). By launching collisions using Penning ionisation, coincidence measurement can yield a tomographic picture between incoming and outgoing quantum states [1]. Ab initio calculations convoluted to match the experimental resolution demonstrate good agreement with these experiments.
Until now, resolving contributions to the spectra due to individual initial partial waves and Feshbach resonances has been beyond experimental limitations [2]. The latest experiments demonstrate sufficient resolution to resolve these features and thereby test the validity of high-quality potential energy surfaces. By utilising Feshbach resonances characteristic to individual electronic structure methods and basis sets, a systematic comparison can be made between experiment and different levels of theory.
(1) Baruch Margulis et al. Science 380,77-81(2023).
(2) Karl P. Horn et al. JPCL 16 (31), 7862-7867 (2025).
Keywords: Feshbach resonances; Electronic structure; Cold collisions; Scattering theory