Further cluster calculations of the electronic spectra of transition metals

An expression derived by Lloyd (1967) for the density of states of a system of nonoverlapping scattering centres is used to evaluate the electronic spectra of the transition metals iron, nickel and copper. The results of these calculations are compared with previous work and analysed to ascertain the range of applicability of this approach. It is found that the cluster method provides a practical approach to the study of the electronic spectra of strongly interacting systems, such as the solid and liquid transition metals considered here, when they are characterized by a sharp single site resonance closely approaching the ideal Breit-Wigner form.