E. A. AKHADOV, J. BROCK, T. W. TRELENBERG, AND J. G. SKOFRONICK , D. H. VAN WINKLE (Physics Department and MARTECH), S. A. SAFRON (Chemistry Department and MARTECH), Florida State University, Tallahassee, FL 32306; F. FLAHERTY, Valdosta State University, Valdosta, GA 31698,

Helium atom scattering is employed to study surface structure and dynamics of the rutile TiO₂(110) single crystal. The surface preparation method followed established techniques¹. Structure in both high symmetry [1-10] and [001] directions was investigated and results agree with earlier STM studies¹. The specularly reflected signal was observed by varying the beam wave vector from 6 Å^-1 to 11 Å^-1. This provides information on step-height evolution on the surface and demonstrates how substrate temperature affects that evolution. Surface dynamics measurements were performed in [1-10] and [001] directions. Two dispersionless modes, one around 7 meV and another around 1-2 meV, and other features of surface vibrations were observed.

*Supported by U. S. Department of Energy Grant Number DE-FGO2-97ER45635.