Gyromagnetic Ratio in the Hyperfine Structure of Doublet States

Perturbation of the hyperfine structure of an electronic p1/2 state by the p3/2 state is calculated using relativistic electronic functions. The main effects are a change in apparent nuclear g factor and a common lowering of all p1/2 sublevels. Energy corrections due to the perturbation of one level of a doublet term by the other when i is {} and j is arbitrary are also obtained.