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We apply the Poisson sum rule to obtain formal expressions for the Fouriercoefficients of the potential of a lattice of generalized charge. Eachgeneralized charge is assumed to contribute to the potential a term whichdepends only on the vector displacement from the charge's location. Thecoefficients are explicitly calculated for Coulomb and Yukawa-type individualparticle potentials. The potentials of finite and disordered lattices are alsobriefly considered.

Fourier expansions for the potentials of lattices of charge