Isotope shifts and hyperfine splitting of the {}¹S₀rightarrow{}³P₁ transition in zinc

We report laser-induced-fluorescence spectroscopy of the \({}^{1}S_{0}\rightarrow{}^{3}P_{1}\) intercombination transition in neutral zinc at \(307.6~\mathrm{nm}\). Isotope shifts are measured for all stable isotopes with kHz-level precision, improving previous data by about two orders of magnitude. For \(^{67}\mathrm{Zn}\), we resolve the excited-state hyperfine structure and determine \(\delta\nu_{\mathrm{COG}}^{67,64}=1085.933(4)~\mathrm{MHz}\), \(A=608.922(1)~\mathrm{MHz}\), and \(B=-18.995(4)~\mathrm{MHz}\). A King-plot comparison with the \({}^{1}S_{0}\rightarrow{}^{1}P_{1}\) transition at \(214~\mathrm{nm}\) gives field- and mass-shift parameters of \(F_{307.6,214}=1.17(5)\) and \(K=-153(60)~\mathrm{GHz\,u}\). These results provide the spectroscopic basis for narrow-line cooling and precision measurements based on zinc, including the development of an optical clock.