Using the Chodorow potential we have conducted a band-by-band analysis of the structure in the photoemission from cesiated copper and have determined the location and extent $\overrightarrow{\mathrm{k}}$ space of the optical transitions involved. We show that the Chodorow potential yields copper $d$ bands accurate to 0.1 eV, that low-energy photons lead to transitions near the surface of the Brillouin zone, and that free-electron bands are responsible for very localized activity while $d$ bands yield activity which is extended in $\overrightarrow{\mathrm{k}}$ space.

• Received 2 May 1973

DOI:https://doi.org/10.1103/PhysRevB.8.2546