About the relations between polarizability and Hartree-Fock instabilities. Part 1. The hydrogen molecule

Relations between ab initio Hartree-Fock non-singlet instabilities and electric dipole polarizabilities have been investigated by studying the H₂ dissociation using the minimal STO-3G and Sadlej polarized atomic basis sets. Particular attention is paid to the effects of including the electron correlation via unrestricted Hartree-Fock, Møller-Plesset, configuration interaction, and coupled cluster techniques.