Adsorption of ethene, propene and 3,3,3-trifluoropropene on Mo(100) surfaces modified by 0.9-1.1 ML of oxygen was studied by UPS. Ethene and propene molecularly adsorb to oxygen modified Mo(100). The binding energy shift in the π-orbital of both molecules is consistent with bonding by π-electron donation to surface Lewis acid sites. Molecular adsorption of CF3CHCH2 produces a π-orbital shift to lower binding energy. This observation along with the calculated electronic structure of CF3CHCH2 is interpreted as evidence for a surface chemical bond dominated by backdonation of electrons from the surface to unoccupied π*-orbitals on the adsorbate.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces