High-resolution x-ray photoemission spectra of silver

An electron spectrometer fitted with an x-ray monochromator for $\mathrm{Al} K{\alpha }_{1,2}$ radiation (1486.6 eV) has been used to record high-resolution x-ray photoelectron spectra for the $4d$ valence band as well as the $3d$ spin doublet in silver. The core-level spectrum has a line shape that can be described successfully in terms of the many-body theory of Mahan, Nozières, and De Dominicis. The $4d$ spectrum agrees well with predictions based on a relativistic-augmented-plane-wave band-structure calculation.