Valence Band Structure of PbS from Angle-Resolved Photoemission

Abstract

The angular dependence of uv- (21.2-eV photon energy) induced photoemission from single-crystal PbS has been investigated. The dependence of the positions of observed peaks on ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensuremath{\parallel}}$ is compared with the prediction of band-structure calculations. Nearly perfect agreement between theory and experiment is found by assuming that only peaks in the appropriate one-dimensional density of initial states calculated along lines of fixed ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensuremath{\parallel}}$ contribute to the observed spectra.