Relativistic energy, oscillator strengths and transition rates of the 1s(2)2lnl S-1(m) (n=2-6, m1-5) states for Be-like system
Variational calculations are carried out with a multiconfiguration-interaction wave function to obtain the relativistic energies of the 1s(2)2lnl S-1(m) (n = 2-6, m1-5) states for the beryllium isoelectronic sequence (Z = 4-10). Relativistic corrections and the mass polarization effects are evaluated with the first-order perturbation theory. The identifications of the energy levels for 1s(2)2lnl S-1(m) (n = 2-6, m1-5) states in the Be-like ions are reported. The oscillator strengths, transition rates and wavelengths are also calculated. The calculated results are compared with other theoretical and experimental data in the literature.
oscillator strengths variational techniques lifetimes transition moments relativistic and quantum electrodynamic effects in atoms and molecules