Electron energy loss spectroscopy (ELS) and X-ray photoelectron spectroscopy (XPS) have been used to characterize CO adsorbed alone and coadsorbed with hydrogen on Ni(100) at low temperatures. Evidence is presented for a significantly weaker bond between CO and the substrate in the presence of coadsorbed hydrogen as compared to CO adsorbed alone. This is reflected by a growth of satellite intensity and a shift to higher binding energy of XPS C(1s) and O(1s) core lines when hydrogen is present. The ELS data show that the splitting between the 2πb and 2πa levels decreases when hydrogen and CO are coadsorbed.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry