Gauge Invariance of the Hartreehyphen;Fock Approximation

摘要

(i) Gauge invariance in the presence of nonlocal potentials is reviewed. It is shown that the uncoupled Hartreehyphen;Fock method isnotgauge invariant. (ii) Gauge invariance of variational calculations is reviewed and it is shown that the coupled Hartreehyphen;Fock approximation is gauge invariant. (iii) A procedure for choosing a best gauge is suggested and in a special case is shown to reduce to a method recently proposed by Karplus and Kolker.