Correlated n1,3S states for two-electron atoms in screened potentials

Abstract

Two-electron atoms in screened and exponential cosine screened Coulomb potentials are studied. We have calculated within a Configuration Interaction approach, the ground and first excited states energies, and other mean values, for H−, He and Li+. We analyze their evolution with the screening parameters, and provide practical fits which allow for a practical and rapid evaluation for plasma applications.