The isotope shifts in the 283.3-nm resonance line of natural lead were measured by atomic-beam absorption spectroscopy with a 9.1-m focal-length spectrometer. The spectrum was calibrated internally by the measured hfs separation of 207Pb [ J.-L. Cojan and H. R. Saussereau, C. R. Acad. Sci. Ser. B 277, 415 ( 1973)] and by the value calculated from the level-crossing results of Saloman and Happer [ Phys. Rev. 144, 7 ( 1966)] and gJ of Rudi-Saussereau et al. [ Opt. Commun. 9, 186 ( 1973)]. The isotope shifts relative to 208Pb are −46.6(6), 207Pb center of gravity; −74.5(6), 206Pb; −142(3), 204Pb. The values are in units of 0.001 cm−1, the negative sign indicating a shift to lower wave numbers. The precision is nearly 1 order of magnitude greater than that of previous measurements.
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