The low temperature CO/H coadsorption state on NiP{100}: X-ray absorption and photoemission studies

Angle-resolved photoemission and X-ray absorption spectroscopy have been used to re-examine the electronic structure and orientation of the low-temperature CO/H-coadsorption state observed on the N{100} surface. Although the C-O axis remains perpendicular to the surface, the photoemission spectrum is different from that of the pure Ni{100} system, showing some evidence for satellite structure. A comparison is made with CO on Cu{100}, a similar weak chemisorption system.