Structure of TiO2 Rutile (110) (1 × 1) from Ion Scattering Measurements

Abstract

9.22 keV oxygen ion scattering has been used to examine the (110) surface structure of TiO 2 rutile. Peaks in the spectrum of the emitted ions at 45° and at 77° are found at the energies expected for O +– Ti and O +– O collisions by surface atoms. Surface preoparation to optimize the 1 × 1 structure involved annealing a previously sputtered surface to 600°C, first in 10-6 Torr of O 2, and then in UHV. Azimuthal and elevation angular variations of the yields for low incidence angles show shadowing effects. Preliminary analysis seems to be consistent with the (1 × 1) model of a complete surface layer, with rows of oxygen atoms above on the titanium bridge sites. The data suggests that our sample preparation produces incomplete rows of above-surface oxygen atoms, or frequent steps.