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Radiative properties of 1s2l2l′3l′′ 5Le,o (l = s, p; l′ = p; l″ = s, p, d; L = P, D) states are studied using multi-configuration Rayleigh–Ritz method from Z = 7 to 14. Absolute energies including mass polarization and relativistic corrections are reported for the first time. The contribution of quantum electrodynamics and nuclear field shifts to the total energy is estimated. The variation of the fine structure splitting values with the configuration structure and with the nuclear charge number Z is discussed. The oscillator strengths and the radiative transition rates are calculated using nonrelativistic wave functions. The calculated wavelengths and lifetimes are compared with the theoretical and experimental references.

A comprehensive theoretical study of atomic characteristics of energy levels and transitions for the core-excited 6Se,o(n) and 6Pe,o(n) (n=1–5) states of the boron isoelectronic sequence (Z=6–14) are investigated by the Rayleigh–Ritz variation method and multi-configuration interaction wavefunctions. The relativistic corrections and mass polarization effects are included by first-order perturbation theory. The configuration structures of the high-lying sextet series 6Se,o(n) and 6Pe,o(n) (n=1–5) of the B-like ions are assigned. The transition rates and wavelengths for the electric dipole transitions 6Se,o(n)—6Po,e(n) (n=1–5) of the B-like ions are calculated and compared with currently available theoretical and experimental data. Furthermore, the radiative transition rates and wavelengths for the important dipole transitions are discussed with the increase of nuclear charge number Z. The calculations will provide useful data for identification of spectral lines arising from the solar atmosphere and the experimental study in future work.

Energies, radiative and Auger transitions of the 1s vacancy resonances 1s2s22p2, 1s2s22p3p, 1s2s2p3, 1s2p4, and 1s2p33p, 4L (L=S, P, D) for the neutral boron atom are calculated using the saddle-point variation and saddle-point complex-rotation methods. Large-scale wave functions are used to obtain reliable results. Relativistic and mass polarization corrections are included by the first-order perturbation theory. The calculated term energies, x-ray wavelengths, and Auger electron energies for these core-excited states are compared with available theoretical and experimental results. Auger electron energies and branching ratios are used to identify high-resolution B Auger spectrum produced in 300 keV B+ on CH4 collision experiment. It is found that the Auger decay of core-excited states of the boron atom gives significant contributions to Auger spectrum in the range of 165–210 eV, and many previously unknown line identifications are presented.