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

Abstract

Combining the multi-configuration Dirac-Hartree-Fock (MCDHF) method
and the model-QED approach, the wave functions, transition energies and hyperfine
structures constants for 2l, 3l states in Li-like Ne7+, Mg 9+, Al 10+, P 12+, Ar 15+ and
Ca 17+ ions are calculated. The effects of electron correlation, Breit interactions, nuclear recoil and quantum electrodynamics (QED) effects are analyzed in detail. We
find that the contribution of the non-diagonal elements of the self-energy is significant
for the 2p1/2 → 2s 1/2 and 2p 3/2 → 2s 1/2 transitions. However, for the 3l → 2s 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%.