Photoemission Study of Quasi-Two Dimensional Metal; Ag₂F

Abstract

Ultraviolet (UPS) and X-ray (XPS) photoemission spectra of quasi-two dimensional metal Ag₂F are presented. Three prominent bands are found at about 2.0 eV, 4.6 eV and 6.0 eV from the Fermi level in the UPS spectrum. They are assigned to the F 2p state, the Ag 4d state and the mixture of the two states, respectively. The comparison of the photoemission spectra with a recent LAPW band calculation shows that the calculated 4d band is shifted toward the lower binding energy by about 1 eV relative to that of the experiment. This discrepancy suggests that the 16th band which forms a small ellipsoidal Fermi surface in the LAPW calculation may be above the Fermi level.