Sub-Doppler measurements yield A and B hyperfine constants for 171Yb and 173Yb that agree with most prior values, but reveal 3P1 centers of gravity about 0.5 to 0.8 MHz higher than previously reported.
Frequency differences relevant to the hyperfine constants along with systematic and statistical uncertain- ties
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Hyperfine constants and line separations for the $^{1}S_{0}-\,^{3}P_{1}$ intercombination line in neutral ytterbium with sub-Doppler resolution
Sub-Doppler measurements yield A and B hyperfine constants for 171Yb and 173Yb that agree with most prior values, but reveal 3P1 centers of gravity about 0.5 to 0.8 MHz higher than previously reported.