3.1.2.6 Group IA (alkali metals): Li, Na, K, Rb, Cs

This chapter discusses electron structure of group IA (alkali metals). Bulk energy band, self-consistent electronic energy band structure, theoretical electron structure of lithium (Li) are shown. Distance between the image plane and the last atomic layer for the (111), (100) and (110) faces of lithium is illustrated. The electronic band structure of Na(110) shows no significant difference to the projected bulk band structure, especially there are no occupied electronic SS. The illustrations for sodium (Na) include surface state, surface charge density, effective potential, momentum dispersion, plot of the relevant free-electron bands, electron structure, local density of state, and comparison of quasiparticle dispersion to band structure. The electronic structure of the (001) surface of bcc K has been studied by a direct determination of the density matrix in a local orbital basis. The illustrations for potassium (K) include electronic pseudo-density distribution, self-consistent potential, and momentum dispersion. Projection in the plane k_xk_y of curves of rubidium (Rb) for different values of component k_z normal to the surface, in the two directions of symmetry Δ(a) and Σ(b) are shown. Surface charge density and effective potential averaged over the surface of Cs(110) are also illustrated.