Energy levels of the ground state and the 2s2pn(J=1) excited states of berylliumlike ions: A large-scale, relativistic configuration-interaction calculation

Abstract

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