Magnetic and Electrical Properties of Small Diatomic Molecules. I. Diamagnetic Susceptibility, Proton-Shielding Constant, and Electric Polarizability of the Hydrogen Molecule

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Abstract
An unambiguous exact variational procedure is given for the calculation of certain weak interaction energies starting from any given approximate ground-state wavefunction. The method is illustrated by numerous calculations on the hydrogen molecule using five different ground-state wavefunctions.