Adiabatic potential energies for NaK+, NaRb+, NaCs+, KRb+, KCs+, RbCs+, Na+2, K2+, Rb+2, and Cs+2 molecular ions

Abstract

By using Hellmann-type model potentials for alkali atoms, the many-electron problem of the alkali molecular ions is reduced to a three-body problem. The Σ adiabatic potential curves have been calculated for ground and excited states of diatomic molecules formed from an alkali atom (Na, K, Rb, Cs) and an alkali ion (Na+, K+, Rb+, Cs+). All the ions turn out to be stable, and the energies we obtain are believed to be reliable within a few hundredths of an electron volt.