Ultralong-range Rydberg Cs₂ molecules investigated at the Ab initio level of theory

Rydberg molecules have been extensively investigated recently owing to rapid developments in ultracold experiments, which pave the way for their preparation. Many Rydberg molecules formed by alkali atoms, such as Rb₂ and Cs₂, have been produced and studied experimentally on the basis of good sources of corresponding cold atoms. On the other hand, quantitative theoretical investigations on Rydberg molecules, such as at the ab initio level, are still scarce. Very recently, an efficient method of studying Rydberg molecules at the ab initio level has been proposed. Following this method, we studied the potential energy curves and vibrational energy levels of Rydberg Cs₂ molecules. (author)