Observation of Feshbach resonances between two different atomic species

We have observed three Feshbach resonances in collisions between Li-6 and Na-23 atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional Li-6-Na-23 resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.