Electron Energy Bands in Cesium

The orthogonalized plane wave method and the cellular method have been applied to a calculation of electronic energy levels in cesium. The same crystal potential was used for all states. Wave functions of core electrons, required in the application of the orthogonalized plane wave method, were determined for this potential. The cohesive energy was calculated according to a simple model. The magnitude at a nucleus of the wave function of an electron on the Fermi surface was estimated by perturbation theory. The energies of twenty-four states at four symmetry points of the Brillouin zone have been obtained. The bands inferred from these results are compared with those in other alkali metals.