Physical Review A - Atomic, Molecular, and Optical Physics
The quantum electrodynamic recoil correction for lithium in the 22S1/2, 32S1/2 and 22PJ states was evaluated, and its impact on lithium isotope shifts was examined. The nonrelativistic variational wave functions were constructed from fully correlated basis sets in Hylleraas coordinates. Results for the total transition frequencies were shown to be in good agreement with experiment, but there were discrepancies between theory and experiment for isotope shift in the fine structure splitting for 1s22p2P state.
Yan, Z. C. and Drake, Gordon W. F.. (2002). Lithium transition energies and isotope shifts: QED recoil corrections. Physical Review A - Atomic, Molecular, and Optical Physics, 66 (4), 425041-425048.