Photoemission from Pb

Photoelectron energy spectra for photon energies up to 21.2 eV have been obtained from lead surfaces prepared by evaporation in the ultrahigh vacuum measuring chamber. The results, which cannot be explained on a simple density of states model, are discussed with reference to previously reported band calculations. Attempts were made to reduce the work function by a deposit of caesium but this altered the spectra drastically, probably due to a reaction between lead and caesium.