Surface lattice dynamics of rutile TiO2(110) using helium atom surface scattering -: art. no. 035409

The lattice dynamics of the rutile TiO2(110) Surface has been investigated by means of high-resolution helium atom scattering (HAS) techniques over the temperature range of similar to 100-1000 K. HAS diffraction in the (Gamma X) over bar, (Gamma S) over bar, and (Gamma Y) over bar surface Brillouin zone directions indicates that almost the entire surface retains the bulk termination (1 X 1) structure under the preparation conditions employed. Surface phonon dispersion curves in the (Gamma X) over bar, (Gamma S) over bar, and (Gamma Y) over bar regions of the surface Brillouin zone, obtained through inelastic atom scattering measurements of single-phonon creation and annihilation events, reveal changes in the surface forces as the temperature of the surface varies. Although model calculations for the dynamics of this surface are not currently available, the observed modes are interpreted, in part, by comparison with calculations reported for the rutile MgF2 (110) surface.