The Use of the GI Method in Band Calculations on Solids

The application of the GI method to band calculations is discussed with primary emphasis on the alkali metals. The GI method goes beyond Hartree-Fock by allowing all orbitals to split, however the total wavefunction is modified so as to retain the correct spin symmetry. We find that the resulting band structure leads to a natural explanation of such puzzling properties as, the magneto-resistance, the prepeaking of the soft X-ray emission spectrum of Li, and the Mott Paradox.