Efficient conversion of ultracold Feshbach-resonance-related polar molecules into ultracold ground state (X $\mathsf{^{1}\Sigma^ + }$ $\mathsf{v = 0}$ , $\mathsf{J = 0}$ ) molecules

Abstract

It is proposed that bound states of ultracold heteronuclear alkali dimer molecules derived from Feshbach resonances can be efficiently converted into true ground state ultracold molecules (X \(^{1}{\Sigma}^{ + }\) v = 0, J = 0) by a stimulated Raman process via b \(^{3}{\Pi} \sim {\rm A}\) \(^{1}{\Sigma}^{ + }\) mixed levels. This is illustrated and discussed for five of the ten polar heteronuclear alkali dimers: LiNa, NaK, NaRb, RbCs, and especially KRb.