Doubly excited resonance states of two-electron systems in exponential cosine-screened Coulomb potentials

Abstract

We have made an investigation on the 2 s 2 S e 1 resonance states in two-electron systems interacting with exponential cosine-screened Coulomb potentials (ECSCP) within the framework of stabilization method. Highly correlated wave functions are used to take into account the correlations of the charge particles. Results for resonance energies and widths are reported for Z = 1 , 2 and 3. For the unscreened case, our reported results are in nice agreement with the results so far available in the literature.