MULTIBAND APPROACH TO SURFACE RESONANCES

The matching formalism, which has been introduced recently [W Jaskolsk i, Phys Rev, B45, 4398 (1991)], is used to find image-induced resonanc es of the (111) surface of Al, Cu and Ag. The method is applied within a multiband pseudopotential model. The resonances are identified with the maxima of the local surface density of states. The crystal-derive d localized surface states are also found. The applicability of the me thod and the usefulness of the pseudopotential model are discussed.