Isotope shifts and hyperfine structure in the 555.8-nm 1S0 → 3P1 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 S-1(0)-> P-3(1) 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, Yb-171(1/2 -> 3/2) and Yb-173(5/2 -> 3/2), which we resolve by applying a magnetic field. We thus obtain the hyperfine constants in the P-3(1) 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.