We report high-resolution slow-electron velocity-map imaging (SEVI) of cryogenically cold $\mathrm{Se}{\mathrm{H}}^{-}$ and $\mathrm{Te}{\mathrm{H}}^{-}$ anions. The resolved rotational structures are well reproduced by our photodetachment rotational simulations, yielding highly accurate electron affinities (EAs) of 2.212 523(27) eV for SeH, and 2.107 686(35) eV for TeH, improving the precision by a factor of more than 400 for TeH. This work demonstrates an effective approach for precisely determining electron affinities and molecular constants by combining high-resolution cryo-SEVI spectroscopy with photodetachment rotational simulations. The accurate experimental data provide benchmarks for theoretical calculations of these heavy hydrides.

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• Atomic & molecular structure
• Electronic structure of atoms & molecules
• Molecular spectra
• Rotational states