Hyperfine constants, nuclear magnetic shielding and spin–spin coupling parameters for AgI and CuI

The high-resolution pure rotational spectra of CuI and AgI have been reinvestigated in the frequency range 2.5–18 GHz using microwave Fourier transform spectroscopy. Gaseous samples of the diatomic metal iodides have been obtained by laser ablation of target rods made of suitable solid precursors. Improved rotational parameters, nuclear quadrupolar coupling constants, and spin–rotation interaction constants have been obtained, along with the first reported spin–spin coupling parameters for copper iodide. Information about the anisotropy of nuclear magnetic shielding and the indirect spin–spin coupling in the absence of intermolecular effects are derived from the high-resolution rotational spectroscopic data.