We report laser-induced-fluorescence spectroscopy of the ${}^{1}S_0\to {}^{3}P_1$ 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 $\delta {\nu }_{\mathrm{COG}}^{67,64}=1085.933\left(7\right)\mathrm{MHz}, A=608.922\left(3\right)\mathrm{MHz}$, and $B=-18.995\left(10\right)\mathrm{MHz}$. A King plot comparison with the ${}^{1}S_0\to {}^{1}P_1$ 214-nm transition results in field- and mass-shift parameters of $F_{307.6,214}=1.17\left(5\right)$ and $K_{307.6,214}=-153\left(60\right)\mathrm{GHz}\mathrm{u}$. These results provide the spectroscopic basis for narrow-line cooling and precision measurements based on zinc, including the development of an optical clock.

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• Electronic transitions
• Fine & hyperfine structure
• Isotope shift
• Atomic & molecular beams
• Atoms
• Fluorescence spectroscopy