Hyperfine structure and isotope shifts of the (4s²)¹S₀ (4s4p)¹P₁ transition in atomic zinc

We report absolute frequency, isotope shift, radiative lifetime, and hyperfine structure measurements of the (4s2) 1S0 -> (4s4p)1P1 (213.8 nm) transition in Zn I using a cryogenic buffer gas beam. Laser-induced fluorescence is collected with two orthogonally oriented detectors to take advantage of differences in the emission pattern of the isotopes. This enables a clear distinction between isotopes whose resonances are otherwise unresolved, and a measurement of the 67Zn hyperfine structure parameters, A(67Zn) = 20(2) MHz and B(67Zn) = 10(5) MHz. We reference our frequency measurements to an ultralow expansion cavity and achieve an uncertainty at the level of 1 MHz, about 1 percent of the natural linewidth of the transition.