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Long-range dispersion energies for the atom pairs He–He, He–Be, and Be–Be in their ground states have been calculated in the form E disp=C6/R6+C8/R8+C10/R10+C11/R11+C12/R12, the coefficients Cn being obtained from the appropriate dynamic polarizabilities at imaginary frequencies. The needed polarizabilities of imaginary argument have been calculated within the time-dependent coupled Hartree-Fock approximation. Three-body nonadditive contributions to the interaction energies have been also evaluated.
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Arrighini et al. (1971) studied this question.
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