Calculated Photoemission Spectra of Na

Abstract

We report a detailed calculation of the photoemission spectra of Na for electrons emitted normal to the (110) surface. The experimental results of Jensen and Plummer have been taken as an indication that the conduction band of Na is severely distorted and hence that a charge-density wave exists in the system. Our calculation confirms just the opposite, i.e., that the band is not strongly distorted from a free-electron band. The calculation is able to reproduce the experimental data closely; it also predicts an angle dependence of the spectra---a feature which needs to be examined experimentally.