Abstract
Performing laser-atomic beam spectroscopy, we have remeasured the transition frequencies and the fine structure splitting of the lithium, sodium and potassium resonance lines. Additionally, the isotope shifts6Li-7Li could be determined with high accuracy. Transition frequencies were determined by means of a high-precision lambdameter working at vacuum conditions, calibrated by saturation absorption of127I2. Frequency differences up to 1 THz could be determined with the help of a carefully calibrated marker etalon with systematical errors smaller than 1 MHz.
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