PUBLICATION ABSTRACTS, W. van Wijngaarden           2009

Precise isotope shift and fine structure measurements are critically reviewed.
Each experiment was checked whether data found for different transitions yielded consistent values for the relative nuclear charge radius squared ∆r² of ^6,7Li. Experiments that passed this test found ∆r² = 0.735 ± 0.036, 0.755 ± 0.023 and 0.739 ± 0.013 fm² by
studying the Li⁺ 1s2s ³S₁ 1s2p ³P transition, the Li D lines and the Li 2S_1/2 - 3S_1/2
transition, respectively. These data determine the relative nuclear charge radius 25 times more accurately than electron scattering. Similarly, averaging the most reliable fine structure data gives 62,678.75 ± 0.55 MHz for the ⁷Li⁺ 1s2p ³P_1,2 interval in good agreement with theory. The results for the ^6,7Li 2P fine structure intervals, 10,052.954 ± 0.049 and 10,053.154 ± 0.040 MHz, exceed computed values by 2 MHz and yield a specific isotope shift which is nearly a factor of 2 lower than a theoretical estimate.