Electronic and geometric structure of Cs on graphite (0001)

• Published in: Surface science Vol. 364; no. 3; pp. 266 - 272
• Main Authors: Hunt, Michael R.C., Durston, Peter J., Palmer, Richard E.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.1996; Amsterdam Elsevier Science; New York, NY
• Subjects: Alkali metals; Chemisorption; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Collective excitations (including plasmons and other charge-density excitations); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron energy loss spectroscopy; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Graphite; Low energy electron diffraction (LEED); Physics; Surface and interface electron states; Chemisorption; Low energy electron diffraction (LEED); Alkali metals; Electron energy loss spectroscopy; Graphite; Electronic structure; Adsorbed state; Cesium; Experimental study; Surface plasmons; Surface structure
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(96)00629-2

An investigation of the geometric and electronic structure of submonolayer coverages of Cs adsorbed on the graphite (0001) surface has been carried out. At very low coverages a dispersed phase is observed, similar to that previously reported for the case of K adsorption on graphite, together with a surface plasmon frequency shift induced in the substrate by charge redistribution. However, rigid-band calculations indicate that the nominal charge transfer to the substrate from the dispersed Cs adatoms is greater than that from K adatoms. At higher coverages, some qualitative differences are seen when the electronic excitation spectra for Cs are compared to those for K overlayers. These differences may be attributed to the geometric structure of the adsorbate layer.