Isotope shifts and fine structures of Li-6,Li-7 D lines and determination of the relative nuclear charge radius

摘要

The Li-6,Li-7 D lines were excited using an electro-optically modulated cw dye laser that intersected an atomic beam. Fluorescence was recorded as the laser was scanned across the resonance. Hence each transition was multiply excited allowing for calibration of the frequency scan. The Li-6,Li-7 2P fine structures were found to be 10 052.964 +/- 0.050 and 10 053.119 +/- 0.058 MHz. The D1 and D2 isotope shifts were determined to be 10 534.039 +/- 0.070 and 10 534.194 +/- 0.104 MHz. The latter imply values for the Li-6,Li-7 relative nuclear charge radius that are within 20x10(-3) fm of each other, which is consistent with the estimated uncertainties.