Electronic structure of the TiO thin film on Ag(1 0 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.