Photoemission spectra and band structures ofd-band metals. VIII. Normal emission from Cu(111)

Abstract

The normal photoemission spectra from Cu(111) have been calculated using a simple bulk-band-structure model. Momentum matrix elements are included and are calculated from the $k$-space derivatives of a combined-interpolation-scheme Hamiltonian. For $s$-polarized light the results are in excellent agreement with the recent experimental results of Knapp et al. For $p$ polarization, agreement is obtained only after an artificial suppression of the relative intensity of the perpendicular component of the electromagnetic field by a factor of ∼5. It is suggested that this suppression arises through local-field effects in the vicinity of the surface.