Fig. 3

Long-range Rydberg molecules. a and (b) the scattering process involving an electron in a diffuse Rydberg orbital and a ground state Rb atom which gives rise to sets of bound molecular eigenstates. c Experimentally measured transitions to the lowest vibrational states of long-range Rb₂ Rydberg molecules in the vicinity of the 37s (bottom), 36s (middle) and 35s (top) single-atom Rydberg states. From [67] with permission