Rydberg states converging to the N 2+2 ionized states

Abstract

The binding energy of a given Rydberg electron, nl, bound by a doubly ionized atomic core, is compared with the binding energy of the same Rydberg electron, nl, bound by a singly ionized atomic core. It is shown that the ratio between these two binding energies is nearly independent of the nature of the atomic cores. Assuming that this independence extends to diatomic molecules, we have estimated the binding energies of the Rydberg electrons bound by the N 2+ 2 ion. Using these binding energies and the equilibrium internuclear distances of N 2+ 2, we have identified, for the first time, Rydberg states converging to the N 2+ 2 ionized states in the core-level and the valence-level photoelectron spectra. Good agreement between the estimated and the observed Rydberg-state energies indicates that the assumption used above is valid.