Abstract
In this paper we report the observation of translationally ultracold heteronuclear groundstate molecules in a two species magneto‐optical trap (MOT) containing 39K and 85Rb atoms. The KRb molecules are produced via photoassociation and detected by multiphoton ionization. Their temperature and formation rate constant were characterized. The two species MOTs may be used in the future as a reliable source of ultracold molecules to be captured by electrostatic, magnetic or optical traps. This possibility will certainly motivate further investigation of quantum collective effects as well as high‐resolution spectroscopy of the rovibrational level structure of cold heteronuclear molecular systems.
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