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

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 $265.44\pm 0.15$ G and $372.4\pm 1.3$ G. We also directly measure the small binding energy of the molecules through resonant magnetic-field association.

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References in corpus (5)

• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Ultracold heteronuclear molecules in a 3D optical lattice
• Observation of molecules produced from a Bose-Einstein condensate
• Spontaneous dissociation of long-range Feshbach molecules
• Molecule Formation in Optical Lattice Wells by Resonantly Modulated Magnetic Fields

Cited by in corpus (38)

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