Energies, fine structure, and radiative transitions of the high-lying core-excited states 6Se,o(n) and 6Pe,o(n) (n=1–5n=1–5) for the boron isoelectronic sequence

•The core-excited states 6Se,o(n) and 6Pe,o(n) of B-like ions are studied.•Some energy levels for the high-nn sextet series are reported for the first time.•Configuration structures of these states are checked by fine structure splittings.•Transition rates, wavelengths for these core-excited sextet states are reported.

The Rayleigh–Ritz variation method using a multiconfiguration interaction wavefunction is carried out on the high-lying core-excited states 6Se,o(n) and 6Pe,o(n) (n=1–5n=1–5) for the boron isoelectronic sequence (Z=6–10Z=6–10), including mass polarization and relativistic corrections. Energy levels, fine structure, transition rates, and transition wavelengths for this system are calculated. Some energy levels of the high-nn states are reported for the first time. Wavelengths of the electric-dipole transitions from these core-excited sextet states with quantum electro-dynamical effects and higher-order relativistic corrections are included. The lifetimes of the 1s2s2p23p6So,1s2p33s6So,1s2s2p23s6P, 1s2s2p23d6P, and 1s2p33p6P states for the boron isoelectronic sequence are also reported. Our calculated results agree well in most cases with available theoretical and experimental data in the literature.