Energy, fine structure, hyperfine structure, and transitions for the high-lying multi-excited ⁴P^e,o states of B-like ions

The energies of the high-lying multi-excited states 1s²2s2pnl and 1s²2p²nl ⁴P^e,o (n ≥ 2) for B-like C⁺, N²⁺, F⁴⁺, and Mg⁷⁺ ions are calculated using Rayleigh-Ritz variation method with multiconfiguration interaction, and the inclusion of mass polarization and relativistic corrections. The fine structure and hyperfine structure for these systems are investigated using first-order perturbation theory. The configuration structure of the high-lying multi-excited series is identified not only by energy, but also by its contribution to normalization of the angular spin components, and it is further tested by the addition of relativistic corrections and fine structure splittings. Transition wavelengths including the quantum electrodynamic effects and higher-order relativistic corrections are determined.