The energy levels and Hyperfine structures constants for n = 2 states in boron-like ions

The atomic structure parameters of highly charged ions(HCIs) are of great importance in nuclear fusion research. L-shell ions of high-Z elements, such as boron-like ions, were used to diagnose these hot plasmas. The energy levels and hyperfine structures constants for the 1s²2s²2p, 1s²2s2p², and 1s²2p³ of boron-like ions with $Z$= 36, 39, 40, 46, 49, 56, 57 and 79 are calculated using the multiconfiguration Dirac–Hartree–Fock (MCDHF) method and Model quantum electrodynamics (QED) method. The contributions of the frequency independent and dependent Breit interactions, nuclear recoil effect, and QED effects are discussed in detail. We find that for energy level of low-lying states of low atomic number $Z$ ions, the contribution of the Breit interactions comes mainly from frequency independent contributions. As $Z$ increases, the frequency dependent corrections become important. Especially for $2s2p^2$ ${}^4{P}_{3/2}$ level, the corrections are more than 30% of the total Breit interactions.