Isotope shifts and hyperfine structure in the 555.8-nm S10→P31 line of Yb

We apply our technique of using a Rb-stabilized ring-cavity resonator to measure the frequencies of various spectral components in the 555.8-nm S1₀→P3₁ line of Yb. We determine the isotope shifts with 60 kHz precision, which is an order-of-magnitude improvement over the best previous measurement on this line. There are two overlapping transitions, Y171b(1/2→3/2) and Y173b(5/2→3/2) , which we resolve by applying a magnetic field. We thus obtain the hyperfine constants in the P3₁ state of the odd isotopes with a significantly improved precision. Knowledge of isotope shifts and hyperfine structure should prove useful for high-precision calculations in Yb necessary to interpret ongoing experiments testing parity and time-reversal symmetry violation in the laws of physics.