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Long-range $(n+2)D_{5/2} \, nF_J$ Rydberg macro-dimers are observed in anultracold cesium Rydberg gas for $39\leq n\leq48$. Strong dipolar "flip"($\langle D_{5/2} F_{5/2} \vert \hat{V}_{dd} \vert F_{5/2} D_{5/2} \rangle$,$\langle D_{5/2} F_{7/2} \vert \hat{V}_{dd} \vert F_{7/2} D_{5/2} \rangle$) and"cross" ($\langle D_{5/2} F_{7/2} \vert \hat{V}_{dd} \vert F_{5/2} D_{5/2}\rangle$) couplings lead to bound, fine-structure-mixed $(n+2)D_{5/2}nF_J$macro-dimers at energies between the $F_J$ fine-structure levels. The $DF$macro-dimers are measured by microwave photo-association from opticallyprepared $[(n+2)D_{5/2}]_2$ Rydberg pair states. Calculated adiabatic potentialcurves are used to elucidate the underlying physics and to model the $DF$macro-dimer spectra, with good overall agreement. Microwave photo-associationallows Franck-Condon tuning, which we have studied by varying the detuning of aRydberg-atom excitation laser. Further, in Stark spectroscopy we have measuredmolecular DC electric polarizabilities that are considerably larger than thoseof the atomic states. The large molecular polarizabilities may be caused byhigh-$\ell$ mixing. The observed linewidths of the Stark-shifted molecularlines provide initial evidence for intra-molecular induced-dipole-dipoleinteraction.

Microwave photo-association of fine-structure-induced Rydberg $(n+2)D_{5/2}nF_{J}$ macro-dimer molecules of cesium