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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 utilizepreviously unobserved interspecies Feshbach resonances to create up to 25,000molecules. Even though the $^{85}$Rb gas is non-degenerate we observe a largemolecular conversion efficiency due to the presence of a quantum degenerate$^{87}$Rb gas; this represents a key feature of our system. We compare themolecule creation at two different Feshbach resonances with differentmagnetic-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 smallbinding energy of the molecules through resonant magnetic-field association.Comment: v2 - minor change

physical review letters

Observation of Heteronuclear Feshbach Molecules from a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>85</mml:mn></mml:mmultiscripts><mml:mo>–</mml:mo><mml:mmultiscripts><mml:mi>Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>87</mml:mn></mml:mmultiscripts></mml:math>Gas

Observation of Heteronuclear Feshbach Molecules from aRb85–Rb87Gas