A crucial test of the cellular method

Abstract
Cellular eigenvalues have been computed for copper metal on using exactly the same potential as Burdick and they agree with the augmented plane wave method results within 0002 ryd. Empty-lattice eigenvalues for all irreducible representations of all points of symmetry are correct (with one exception) to 0000 02 ryd, the exceptional error being 00001 ryd. For general k values most errors are below 0005 ryd. These results have been obtained both for face-centred and body-centred cubic lattices.

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