Energies, fine structures, and transition rates of the core‐excited states in BeII

The energies and fine structures of some doubly excited resonances of lithium like beryllium are calculated using the saddle-point variational method. A restricted variational method is used to extrapolate a better nonrelativistic energy. Relativistic and mass polarization corrections are included. Oscillator strengths, transition rates, and wavelengths are also calculated. The results are compared with other theoretical and experimental data in the literature.