Molecular beam studies of alkali promotion: O 2 sticking on Pt(111)+K
Abstract
Molecular beam techniques have been used to study the promotion of O 2 sticking on a Pt(111) surface due to co-adsorbed K. The results show a complicated dependence of this promotion on K coverage, incident energy and surface temperature, and cannot be interpreted in terms of simple one-dimensional charge-transfer models often used to rationalize alkali promotion. There is evidence that molecular precursors, including that due to a physisorbed species, play a dominant role in the sticking of O 2 on the K-modified Pt(111) surface.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- November 1991
- DOI:
- 10.1016/S0009-2614(91)85117-F
- Bibcode:
- 1991CPL...186..125B