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Observation of Heteronuclear Feshbach Molecules from a $^{85}$Rb - $^{87}$Rb gas

S. B. Papp·C. E. Wieman
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Abstract

We report on the observation of ultracold heteronuclear Feshbach molecules. Starting with a $^{87}$Rb BEC and a cold atomic gas of $^{85}$Rb, we utilize previously unobserved interspecies Feshbach resonances to create up to 25,000 molecules. Even though the $^{85}$Rb gas is non-degenerate we observe a large molecular conversion efficiency due to the presence of a quantum degenerate $^{87}$Rb gas; this represents a key feature of our system. We compare the molecule creation at two different Feshbach resonances with different magnetic-field widths. The two Feshbach resonances are located at $265.44\pm0.15$ G and $372.4\pm1.3$ G. We also directly measure the small binding energy of the molecules through resonant magnetic-field association.

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S. B. Papp, C. E. Wieman. 2009-07-01. Observation of Heteronuclear Feshbach Molecules from a $^{85}$Rb - $^{87}$Rb gas. https://doi.org/10.1103/physrevlett.97.180404

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