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A method for increasing the rate of convergence of general crystal lattice sums of the type ₉ ₊ qjqkr−njk is described. The method is applicable for n > 3, or for n > 0 if ₂₄₋₋ qj = 0. A numerical example is given for the London dispersion energy (n = 6) of the benzene crystal. The calculation effort required to obtain the lattice sum was reduced at least tenfold.
Donald E. Williams (Wed,) studied this question.