Theoretical Dynamics of Heavy Rydberg States in Rb2

Rydberg states, characterized by long-range Coulomb interactions, are normally associated with states consisting of an electron and a positively charged atomic or molecular ion, but can also occur as vibrational states in ionic bonds between atoms. In such heavy Rydberg states, the light electron is replaced by a much heavier negative ion. Compared to normal vibrational states these have unusual properties, including extremely large internuclear distances, large dipole moments, and an infinity of states below the ion-pair dissociation limit. Ion-pair states are difficult to observe in experiments, but recently detailed spectra of heavy Rydberg states in H2 and Cl2 have been reported. We collaborate with the experimental groups of E.\ E.\ Eyler and P.\ Gould (UConn) to find heavy Rydberg states in Rb2. Recent theoretical results are presented, and we discuss the potential application of Rb2 heavy Rydberg states in cold matter physics.