Doubly-excited 1,3De resonance states of two-electron positive ions Li+ and Be2+ in Debye plasmas

We investigate the bound 1,3D states and the doubly-excited 1,3De resonance states of two-electron positive ions Li+ and Be2+ by employing correlated exponential wave functions. In the framework of the stabilization method, we are able to extract three series (2pnp, 2snd, 2pnf) of 1De resonances and two series (2pnp, 2snd) of 3De resonances below the N = 2 threshold. The 1,3De resonance parameters (resonance energies and widths) for Li+ and Be2+ along with the bound-excited 1s3d 1,3D state energies are reported for the first time as functions of the screening parameter. Accurate resonance energies and widths are also reported for Li+ and Be2+ in vacuum. For free-atomic cases, comparisons are made with the reported results and few resonance states are reported for the first time.