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Following the double perturbation-theory method used by Deal, Kestner, and Young, dipole, quadrupole, and octopole polarizabilities with and without correlation have been calculated for He and Li+ at imaginary frequencies. Also calculated are the C6, C8, and C10 coefficients for He–He and Li+–Li+ interactions with and without correlation for several Hartree–Fock-type wavefunctions.
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Broussard et al. (1970) studied this question.
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