Approximate Method of Evaluating Lattice Sums of r—n for Graphite

Abstract

The graphite lattice is approximated by a set of planes in which the carbon atoms are assumed to be distributed with uniform density. It is shown that the lattice sums of r^—n taken over the graphite planes can then be expressed directly in terms of tabulated functions. The results of the approximation are compared with the results obtained by direct summation.