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A: Fachverband Atomphysik

A 12: Poster I

A 12.17: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Temperature Dependence of Atom-Ion Feshbach Resonances — •Fabian Thielemann, Joachim Siemund, Wei Wu, Thomas Walker, and Tobias Schaetz — Albert-Ludwigs Universität, Freiburg, Deutschland

We recently observed magnetic Feshbach resonances between atoms and ions using inelastic loss spectroscopy. In our experiment we immerse a single, Doppler-cooled ¹³⁸Ba⁺ ion into a cloud of ultracold, spin-polarized ⁶Li atoms. Collisions lead to sympathetic cooling of the ion to temperatures that allow us to resolve individual Feshbach resonances. The final collision energy depends on many parameters, such as the excess micromotion of the ion in the rf trap, the atom-ion mass ratio and the temperature of the atomic cloud. In this poster, we present experimental results on how the properties of a Feshbach resonance change when the temperature of the atomic bath - and thus the atom-ion collision energy - is varied. This could aide in the partial wave assignment of the surprisingly large number of resonances.