The excitation energies and hyperfine structures for 2l, 3l states in lithiumlike ions

Abstract Combining the multi-configuration Dirac–Hartree–Fock method and the model-quantum electrodynamics (QED) approach, the wave functions, transition energies and hyperfine structure constants for 2 l , 3 l states in Li-like Ne 7+ , Mg 9+ , Al 10+ , P 12+ , Ar 15+ and Ca 17+ ions are calculated. The effects of electron correlation, Breit interactions, nuclear recoil and QED effects are analyzed in detail. We find that the contribution of the non-diagonal elements of the self-energy is significant for the 2 p 1 / 2 → 2 s 1 / 2 and 2 p 3 / 2 → 2 s 1 / 2 transitions. However, for the 3 l → 2 s 1 / 2 transitions, the contribution of non-diagonal elements is small. The accuracy of the currently calculated hyperfine structure constants is expected to be within 1%.