Electronic structure of the TiO thin film on Ag(1Â 0Â 0): Angle-resolved photoemission study

Angle-resolved photoemission spectroscopy (ARPES) has been used to study the electronic structure of the TiO film formed on a Ag(1 0 0) surface. The film was prepared by Ti deposition on Ag(1 0 0) at room temperature in an O2 atmosphere at 3.0 × 10−9 Torr and subsequent annealing at 600 °C, and the film with the composition of TiO0.92 was obtained by this procedure. The conduction band and the valence band of the film are observed at 0-2 eV and 4-8 eV, respectively, and thus these bands are separated by a gap of about 2 eV. Resonant photoemission spectroscopy measurements show that the hν-dependence of the conduction band intensity shows a resonant behavior characteristic of the Ti 3d states. The two-dimensional electronic structure of the states in the conduction band along the (Γ¯X¯) direction of Ag(1 0 0) are measured with ARPES, and it was found that the states show dispersions consistent with the (1 × 1) periodicity.