High-resolution angle-resolved photoemission study of the Ag band structure along Λ

High-resolution angle-resolved photoelectron spectra have been obtained from the (111) face of an Ag crystal for normal electron emission. These spectra made it possible to determine experimentally the valence-band structure of Ag along the high-symmetry line ..lambda.. with better accuracy than previously (P. S. Wehner et al., Phys. Rev. B 19, 6164 (1979)), and also revealed a second flat band near point GAMMA in the conduction bands 23 eV above the Fermi level. The new binding energies at points GAMMA and L were used along with the data of other workers to construct an experimental band structure of Ag with the mixed-basis interpolation scheme of Smith (Phys. Rev. B 9, 1365 (1974)). The augmented-plane-wave calculations of Eckhardt, Fritsche, and Noffke (J. Phys. F 14, 97 (1984)) agree very well with the experimentally determined bands.