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We study the association and dissociation dynamics of weakly boundheteronuclear Feshbach molecules using transverse RF-fields for expectedparameters accessible through the microgravity environment of NASA's Cold AtomLaboratory (CAL) aboard the International Space Station, including temperaturesat or below nK and atomic densities as low as $10^8$/cm$^3$. We show that undersuch conditions, thermal and loss effects can be greatly suppressed resultingin high efficiency in both association and dissociation of Feshbach moleculeswith mean size exceeding 10$^4a_0$, and allowing for the coherence inatom-molecule transitions to be clearly observable. Our theoretical model forheteronuclear mixtures includes thermal, loss, and density effects in a simpleand conceptually clear manner. We derive the temperature, density andscattering length regimes of $^{41}$K-$^{87}$Rb that allow optimalassociation/dissociation efficiency with minimal heating and loss to guidefuture experiments with ultracold atomic gases in space.

Enhanced association and dissociation of heteronuclear Feshbach molecules in a microgravity environment