Polarization Dependence of Angular-Resolved Photoemission fromdBands of Cu

Abstract

We find strong polarization effects in the angular-resolved energy distribution of photoelectrons emitted from a Cu(111) surface using plane polarized light at normal incidence with $\omega =10.2\mathrm{}$ eV. This polarization dependence reveals the symmetry and $\overrightarrow{\mathrm{k}}$ vector of the states involved, in particular for excitation from $d$ states. The spectra can be interpreted assuming direct transitions between bulk states and subsequent elastic emission. No evidence for many-body effects or modification of the states at the surface is observed.