Monolayer Graphite on TiC(111) Studied by Using Angle-Resolved Electron Spectroscopies

Electronic states of monolayer graphite formed on TiC (111) surface have been investigated by means of LEED, XPS and UPS. The chemical shift of XPS Cls peak has indicated that a small amout of charge (10_-2 electrons per carbon atom) transfers from the substrate to the monolayer graphite, which is in consistent with the work function change. In addition, UPS spectra has shown a large change in the energy band structure of the graphite layer. From those data, it has been concluded that the change in the electronic states originates mainly from the interaction between the overlayer and substrate.