Molecular integrals arising in the use of the Hiller–Sucher–Feinberg–Harriman identity for describing the Fermi‐contact interaction

General formulas have been derived for molecular integrals arising in the use of the identity derived by Harriman for describing the Fermi‐contact interaction in a molecule. Computational aspects are discussed and numerical examples are shown for several sets of the usual Cartesian Gaussian‐type orbitals.