D1 and D2 lines in 6Li and 7Li including QED effects

Authors:

• Mariusz Puchalski,
• D. Kȩdziera,
• K. Pachucki

Abstract

Accurate theoretical predictions including leading QED corrections for 2_2P1/2-2_2S1/2 (D₁) and 2_2P3/2-2 _2S1/2 (D₂) transition energies have been obtained for 6^,7Li isotopes. Our results for the Bethe logarithms lnk ₀(22S)=5.178169(4), and for mass polarization corrections Δlnk₀(22S)=0.11381(3) are in disagreement with ones obtained recently in the literature. In contrast, results lnk₀(22P)=5.17981(7) and Δlnk₀(22P)=0.1113(5) are in good agreement with them. From our theoretical predictions and recent measurements of 6^,7Li D lines at NIST, we determine the mean-square charge radius difference between 7Li and 6Li nuclei, in agreement with determinations based on the 3_2S1/2- 2_2S1/2 transition, which demonstrates consistency of atomic spectroscopy determination of fundamental properties of nuclei. © 2013 American Physical Society.