Ground and excited state properties of many-body energies in Liⁿ⁺_nF^-ions

Abstract

Ground and excited state properties of many body energies in Li~ § F-ions were examined at two levels of ab initio theory. The effect of basis set size at configurations specified by two angular variables was tested. The ions in the excited state lattice were found to be more bound than those in the ground state. Discrepancies were observed between the minimal and extended basis set for describing the multibody expansions. Although the ground state V(m, n) terms at m = n 1> 3 were negligible, the excited state V(m, n) terms at m = n ~> 3 were not negligible.