Studies On Energy And Spectral Structure For Excited States Of B And Be- Like Ions

Multi-electron system is a complicated atomic system, which is different from H atomic system, and we can not get analytical solution because of the complicated electron interaction effects. It is the four-electron, five-electron, even six-electron systems that attract us to study. After 20 th, we have a clear understanding of atomic spectra. Scientists carried out a lot of experiments and theoretical works on these systems with many research methods coming out, such as the multi-configuration Hartree-Fock(MCHF) method, multi-configuration Dirac–Hartree–Fock method(MCDF), the many-body perturbation theory(MBPT), and so on. Every method has its own applicable scope and limitations.Energy of the high-lying multi-excited states 1s22s2 pnl and 1s22p2 nl 4Pe,o(n ≥ 2) for B-like C+, N2+, F4+, Ne5+, and Mg7+ ions are calculated using Rayleigh–Ritz variation method with multi-configuration interaction, including mass polarization and relativistic corrections. The fine structure and hyperfine structure for this system are investigated by first-order perturbation theory. Configuration structure of the high-lying multi-excited series is identified by energy and contribution to normalization of the angular-spin components, and further checked by relativistic corrections and fine structure splittings. Transition wavelength including the quantum electrodynamic effect and higher-order relativistic correction of these high-lying excited states are calculated and compared with the literatures. In addition, full core plus correlation method is used to get the energy of ground states and energy, fine structure and hyperfine structure of 1s22s2 p 3Po states for Be-like(Z=11-18) ions. All of the data we computed are compared with the previous theory and the experimental results. The results show that the current calculation can improve the accuracy of the theory, and the results are in good agreement with the experimental results.