Long-Lived Ultracold Molecules with Electric and Magnetic Dipole Moments.

We create fermionic dipolar (NaLi)-Na-23-Li-6 molecules in their triplet ground state from an ultracold mixture of Na-23 and Li-6. Using magnetoassociation across a narrow Feshbach resonance followed by a two-photon stimulated Raman adiabatic passage to the triplet ground state, we produce 3 x 10(4) ground state molecules in a spin-polarized state. We observe a lifetime of 4.6 s in an isolated molecular sample, approaching the p-wave universal rate limit. Electron spin resonance spectroscopy of the triplet state was used to determine the hyperfine structure of this previously unobserved molecular state.