Creation of Ultracold ~(87)Rb~(133)Cs Molecules in the Rovibrational Ground State

摘要

We report the creation of a sample of over 1000 ultracold ~(87)Rb~(133)Cs molecules in the lowest rovibrational ground state, from an atomic mixture of ~(87)Rb and ~(133)Cs, by magnetoassociation on an interspecies Feshbach resonance followed by stimulated Raman adiabatic passage (STIRAP). We measure the binding energy of the RbCs molecule to be hc × 3811.576(1) cm~(-1) and the |v″ = 0, J″ = 0〉 to |v″ = 0, J″ = 2〉 splitting to be h × 2940.09(6) MHz. Stark spectroscopy of the rovibrational ground state yields an electric dipole moment of 1.225(3)(8) D, where the values in parentheses are the statistical and systematic uncertainties, respectively. We can access a space-fixed dipole moment of 0.355(2)(4) D, which is substantially higher than in previous work.