The isotope shifts for 2 2PJ-2 2S and 3 2S-2 2S transition energies in lithium are calculated variationally in Hylleraas coordinates, including nonrelativistic, relativistic, and QED terms up to O(μ/M), O(μ/M)2, O(α2μ/M), and O(α3μ/M) atomic units, and the lowest-order finite nuclear size correction. With high-precision isotope shift measurements, our results can potentially yield a precise determination of the nuclear charge radius for different isotopes of lithium, and especially for the exotic 11Li ``halo'' isotope. For the case of 7Li-6Li, using the nuclear charge radii from nuclear scattering data, our calculated isotope shifts for the 2 2P1/2-2 2S, 2 2P3/2-2 2S, and 3 2S-2 2S transitions are 10 534.31(61)(6) MHz, 10 534.70(61)(6) MHz, and 114 54.31(39)(5) MHz, respectively, where the first brackets indicate the uncertainties due to the nuclear charge radii, and the second brackets indicate the computational uncertainties. The experimental isotope shifts are inconsistent with each other and with theory for these transitions.
Physical Review A
- Pub Date:
- February 2000
- Hyperfine interactions and isotope effects Jahn-Teller effect;
- Relativistic and quantum electrodynamic effects in atoms and molecules;
- Charge distribution