Hyperfine structure of lithium-like ions

Abstract
The hyperfine splitting values of the ground state of lithium-like ions are calculated in the range Z = 7–28. The calculations are based on a combination of the 1/Z perturbation theory and the nonrelativistic configuration interaction Hartree-Fock (CI-HF) method. The relativistic corrections are calculated in the zeroth and first orders in 1/Z. The nuclear charge and magnetization distribution corrections and the radiative corrections are taken into account. The uncertainty of the calculations is estimated to be in the range 0.06–0.15 percent.