Ultralong Rydberg Cs$_2$ Molecules Investigated by Combined ab initio   Calculations and Perturbation Theory
  Vibrational properties of ultralong Rydberg Cs$_2$ molecules are investigated on corresponding potential curves obtained by perturbation theory. The Rydberg Cs$_2$ molecules are associated by a Rydberg Cs($nS/nP$) atom $(n=30-70)$ and a ground state Cs($6s$) atom. The starting point for the perturbation treatment of corresponding Rydberg molecular potential curves is to generate accurate atomic Rydberg states from realistic {\it ab initio} effective core potential. The calculated results have similar characteristics with available experimental and theoretical investigations on Rydberg Rb$_2$ molecules. And this is the first time that Rydberg molecules are studied at the {\it ab initio} level. 
Xiaomeng Liu, Yonggang Yang, Jianming Zhao, Liantuan Xiao and Suotang   Jia
physics.atom-ph