Adsorption of CO on rutile (1 × 1)-TiO2(1 1 0): a molecular beam study

✍ Scribed by M Kunat; U Burghaus

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 487 KB
• Volume: 544
• Category: Article
• ISSN: 0039-6028
• DOI: 10.1016/s0039-6028(03)01028-8

✦ Synopsis

Presented are initial, S 0 , and coverage dependent, SðHÞ, adsorption probability measurements, respectively, of CO on the rutile (1 • 1)-TiO 2 (1 1 0) surface obtained along both high symmetry azimuth directions (i.e. along the ½1 1 1 0 and [0 0 1] azimuth) and parametric in the impact energy, E i ; the angle of incidence, a i ; and the surface temperature, T s . Whereas along the [0 0 1] azimuth approximately a Kisliuk shape of SðHÞ has been observed, for glancing a i and E i P 0:52 eV a turnover from the Kisliuk shape of SðHÞ to an auto-catalytic adsorption (increase in S with H) could be detected along the ½1 1 1 0 direction. Along both azimuth directions S 0 obeys for E i P 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.