Abstract

The procedure for setting up projection operators to derive symmetrized wave functions in crystals is discussed. This includes a description of the projection operator method, discussion of irreducible representations, basis functions, and the multiplication table for space groups, and the application of these methods to setting up symmetrized plane waves, and symmetrized linear combinations of atomic orbitals, for use with the OPW and APW methods of approximating to electronic wave functions in crystals.

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