Calculations of electric dipole hyperpolarizability of polyatomic molecules

Coupled Hartree-Fock perturbation theory is employed to compute electric dipole hyperpolarizabilities of water, ammonia and methane with three different GTO basis sets. The results were extremely sensitive to the form of zero-order HF wave-functions. In some cases large discrepancies between computed and experimental values suggest that the latter ones must be reviewed. A comparison with other computations is also made.