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Relativistic energy, fine structure and hyperfine structure of the core-excited states 1s2s2pnp 5P (n = 2–6) and 1s2p2mp 5So (m = 2–6) for beryllium

The saddle-point variational method and restricted variational method are used to obtain the relativistic energies of high-lying core-excited states 1s2s2pnp 5P (n = 2–6) and 1s2p2mp 5So (m = 2–6) in beryllium, including the mass polarization and relativistic corrections. The oscillator strengths and transition rates are also calculated. The results are compared with other theoretical and experimental data in the literature. The fine structure and hyperfine structure of core-excited states for this system are also explored.