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We report continuous direct photoassociative formation of ultracold KRbmolecules in the lowest vibrational levels $(v"=0 -10)$ of the electronicground state $(X ^1\Sigma^+)$, starting from $^{39}$K and $^{85}$Rb atoms in amagneto-optical trap. The process exploits a newfound resonant coupling betweenthe $2(1), v'=165$ and $4(1), v'=61$ levels, which exhibit an almost equaladmixture of the uncoupled eigenstates. The production rate of the$X^1\Sigma^+$ ($v"$=0) level is estimated to be $5\times10^3$ molecules/sec.

Direct Photoassociative Formation of Ultracold KRb Molecules in the Lowest Vibrational Levels of the Ground State