Hyperfine structure and isotope shifts of the (4s 2 ) 1 S 0 →(4s4p) 1 P 1 transition in atomic zinc

We report absolute frequency, isotope shift, radiative lifetime, and hyperfine structure measurements of the ((4s 2 ) 1 S 0 →(4s4p) 1 P 1 (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 67 Zn hyperfine structure parameters, A( 67 Zn)=20(2)MHz and B( 67 Zn)=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.