Binding Energy Measurement of ⁷Li-¹³³Cs Feshbach Molecules

Yi-Ting Sun^1*, Wei-Xuan Li¹, Yi-Dong Chen¹, Shih-Kuang Tung¹

¹Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Yi-Ting Sun, email:s109022401@m109.nthu.edu.tw

A practical strategy for creating bound atom pairs or molecules at ultra-low temperatures exploits the phenomenon known as Feshbach resonance, wherein free atom pairs resonantly couple into bound states. Quantifying the binding energies of these molecules is crucial for characterizing their bound states and serves as a fundamental groundwork for delving into few-body quantum theories. This presentation will outline the procedure to create heteronuclear ⁷Li-¹³³Cs Feshbach molecules by utilizing radio-frequency (RF) pulses at their 850 G Feshbach resonance. Furthermore, we will introduce a model designed to deduce binding energies from atom-loss line shapes observed in RF spectroscopy.

Keywords: Feshbach molecule, quantum gas, ultracold atoms, few-body physics