A review on the formation of heteronuclear cold molecules

In this paper, we review the present status of the formation of cold ground-state heteronuclear molecules in cold-trapped atomic samples. The experimental techniques and results are presented and reviewed. The molecule production rates are compared among themselves as well as with existing theories. We conclude that theoretical and experimental improvements are necessary to help plan new experiments. The experimental results indicate that KRb and RbCs are the best systems for heteronuclear molecule production.