Heteronuclear Long-Range Rydberg Molecules

We present the formation of homonuclear ${\mathrm{Cs}}_{2}$, ${\mathrm{K}}_{2}$, and heteronuclear CsK long-range Rydberg molecules in a dual-species magneto-optical trap for $^{39}\mathrm{K}$ $^{133}\mathrm{Cs}$ by one-photon UV photoassociation. The different ground-state-density dependence homo- photoassociation rates detection stable molecular ions resulting from autoionization provide an unambiguous assignment. perform bound-bound millimeter-wave spectroscopy to access states not accessible Calculations based on most recent theoretical model atomic parameters do reproduce full set data consistently. This shows that benchmark development models.