Optical Production of Stable Ultracold $^{88}$Sr$_2$ Molecules
  We have produced large samples of ultracold $^{88}$Sr$_2$ molecules in the electronic ground state in an optical lattice. The molecules are bound by 0.05 cm$^{-1}$ and are stable for several milliseconds. The fast, all-optical method of molecule creation via intercombination line photoassociation relies on a near-unity Franck-Condon factor. The detection uses a weakly bound vibrational level corresponding to a very large dimer. This is the first of two steps needed to create Sr$_2$ in the absolute ground quantum state. Lattice-trapped Sr$_2$ is of interest to frequency metrology and ultracold chemistry. 
G. Reinaudi, C. B. Osborn, M. McDonald, S. Kotochigova, and T.   Zelevinsky
physics.atom-ph quant-ph