Transition rates and electron correlation effects for the 2s2p[formula omitted] ([formula omitted]P)3p configuration in N II

Based on the multiconfiguration Dirac–Hartree–Fock (MCDHF) method, accurate atomic spectra data including the transition rates, line strengths, and oscillator strengths for the inner-shell excited configuration 2s2p2 (4P)3p in N II ion are reported by taking into account the core-core, core-valence and valence correlation effects as well as the Breit interaction. Good accordance can be found in the comparison with other calculations and measurements. Meanwhile, by studying the effects of electron correlations on the energy levels and transition rates of 2s2p2 (4P)3p configuration, it is found that the valence correlations of active space nl = {n = 2–7, l = s–i} and the core correlations with regard to 1s2 electrons have the strongly adjusted effect and the balancing influence, respectively. Furthermore, the quintet transitions 2s2p2 (4P)3s 5P–2s2p2 (4P)3p 5L∘ (L = P, D) are found to strictly obey the selection rule ΔS = 0. The branching fractions under this case tend to 1, which is a peculiarly intrinsic property that is recommended to diagnose the lifetimes or rates of quintet states.