An INDO study of the hyperfine coupling constants and equilibrium geometries of some tetra-atomic radicals

Equilibrium geometries and isotropic hyperfine coupling constants have been estimated for the series of radicals CH n F3-n , CH n Cl3-n , CCl n F3-n and S1H n F3-n using the INDO method. The theoretical hyperfine splittings agree well with experimental values including the unusually large proton splittings of 34·6 G and 89·9 G recently reported for SiH2F and SiHF2.