Theoretical Study of Interesting Fine-Structure Splittings for 2 ³ P _0,1,2 States along Helium Isoelectronic Sequence

Abstract

Using the multi-configuration Dirac-Fock method including the Breit interactions and QED corrections, we calculate the fine-structure energy levels of the 2 3 P0,1,2 states along the helium isoelectronic sequence with atomic number up to Z = 36, where LS-coupling is appropriate. Our calculation results agree with the experimental results within about 1%. We elucidate the mechanism of the interesting fine-structure splittings for the 2 3 P0,1,2 states along the helium isoelectronic sequence, i.e. the competitions between the spin-orbit interactions and the Breit interactions which represent the relativistic retardation effect of electromagnetic interactions.

Comprehensive calculations of energy levels, radiative transition parameters, hyperfine structure constants A$_J$-B$_J$, Landé g$_J$ factors and isotope shifts for Sc XX

“…Indelicato [24] calculated the energies required for transitions between 1s2p − 1s2s and 1s2p − 1s 2 levels of helium iso-electronic series upto atomic number Z = 92 using the MCDF method [25]. Qing et al [26] implemented the MCDF method to compute the energy of the 2 3 P 0,1,2 states of He-like ions upto Z = 36. Drake [27] determined the energies of 1s 2 , 1s2s and 1s2p levels of He-like ions till Z = 100 by using relativistic unified method.…”