AVS 50th International Symposium
    Surface Science Monday Sessions
       Session SS1-MoM

Paper SS1-MoM5
Adsorption of CO on Rutile (1x1)-TiO@sub 2@(110): A Molecular Beam Study

Monday, November 3, 2003, 9:40 am, Room 326

Session: Gas-Surface Dynamics
Presenter: U. Burghaus, North Dakota State University
Authors: M. Kunat, Ruhr-University in Bochum, Germany
U. Burghaus, North Dakota State University
Correspondent: Click to Email
Presented are initial, S@sub 0@, and coverage dependent, S(@THETA@), adsorption probability measurements, respectively, of CO on the rutile (1x1)-TiO@sub 2@(110) surface obtained along both high symmetry azimuth directions (i.e. along the [1-10] and [100] azimuth) and parametric in the impact energy, E@sub i@, the angle of incidence, and the surface temperature, T@sub s@. Whereas along the [001] azimuth approx. a Kisliuk shape of S(@THETA@) has been observed, for glancing angle of incidence and E@sub i@ @>=@ 0.52 eV a turnover from the Kisliuk shape of S(@THETA@) to an auto-catalytic adsorption (increase in S with @THETA@) could be detected along the [1-10] direction. Along both azimuth directions S@sub 0@ obeys for E@sub i@ @>=@ 0.52 eV normal energy scaling and below that impact energy total energy scaling. The effect of an intrinsic precursor state is tentatively concluded. A decrease in the heat of adsorption with coverage indicates repulsive lateral interactions of the CO. The results will be discussed in comparison with Monte Carlo Simulations.