Hyperfine and fine-structure measurements of {sup 6,7}Li{sup +} 1s2s {sup 3}S and 1s2p {sup 3}P states

The 1s2s {sup 3}S{sub 1}{yields}1s2p {sup 3}P{sub 1,2} transition in {sup 6,7}Li{sup +} was investigated by exciting a 5-6-keV ion beam with a nearly copropagating ring-dye laser beam. The laser scan was calibrated using an electro-optic modulator to generate frequency sidebands. Results for the {sup 6}Li{sup +} hyperfine splittings are an order of magnitude more precise than existing data in the literature and the {sup 7}Li{sup +} results resolve an 11-MHz (17{sigma}) discrepancy for the {sup 3}P{sub 1-2} fine-structure interval as determined by two previous experiments. The results for 12 (all 13) measured hyperfine intervals in {sup 6,7}Li{sup +} are within 2{sigma} (3{sigma}) of the latest Hylleraas variational calculations.