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Abstract
The Coulomb potential due to a periodic array of point multipoles is found and expressed, in terms of the multipole moments and dimensionless Ewald coefficients, in a form convenient for energy-band calculations by the augmented-plane-wave method. The formalism is then applied to an array of multipoles having the symmetry of the crystal lattice. Numerical values are given for the Ewald coefficients for a monatomic body-centered cubic crystal.
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