Figure 13: (a) Surface densities of d-band states of some selected hyper-d-electronic transition metals. The integral over the densities has been normalized to unity; the vertical line indicates the Fermi level. Indications and labels: dashed-dotted line: Pt (111); thick line: Au (111); thin line: Ag (111); dotted line: Cu (111); dashed line: Ni (111). (b) Lower location: surface densities of d-band states (bulk values differing from exact surface densities for less than 3%) of some selected hypo-d-electronic transition metals (W, Ta, Mo, Nb, color labeled). (Calculated by Professor Wolfgang Schmickler, University of Ulm, Germany.)