Energy levels of the ground state and the 2s2p (J=1) excited states of berylliumlike ions: A large-scale, relativistic configuration-interaction calculation

We have calculated energy levels of the (2)s(2 1)S(0) ground state and the 2s2p P-1,3(1) excited states of berylliumlike ions with Z=10-92 using the relativistic configuration-interaction method. These calculations are based on the relativistic no-pair Hamiltonian which includes Coulomb and retarded Breit interactions and employ finite B-spline basis functions. Quantum electrodynamic and mass polarization corrections are also calculated. Good agreement between theory and experiment for the 2s(2) S-1(0)-2s2p P-1,3(1) transition energies is found throughout the isoelectronic sequence.