CO on Cu(100)—Explanation of the Three-Peak Structure in the X-Ray-Photoemission-Spectroscopy Core Spectrum

Abstract
The x-ray-photoemission-spectroscopy core-level spectrum for CO chemisorbed on Cu(100) is calculated with the transfer of screening charge to the adsorbate taken into account. Using a realistic substrate density of states, we obtain the observed three-peak structure and give a simple interpretation of the results.