Abstract
A gauge-variation method has been used to formulate expressions for the diamagnetic susceptibility and nuclear magnetic shielding in molecules entirely in terms of the ground state wave-function. The inaccuracy of the total value thus calculated is commented on, together with the equivalence of this method to Hasse-type variational calculations. McConnell's long-range approximation and Rebane's work have been discussed in the light of the present work.
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