Author/Authors :
Onsgaard، نويسنده , , J and Hoffmann، نويسنده , , S.V. and Godowski، نويسنده , , P.J and Mّller، نويسنده , , P and Wagner، نويسنده , , J.B and Groso، نويسنده , , A and Baraldi، نويسنده , , A and Comelli، نويسنده , , G and Paolucci، نويسنده , , G، نويسنده ,
Abstract :
It is demonstrated that CO dissociates on a potassium-modified Cu(115) surface at 125 K. The dissociation process is conditioned by both the presence of steps and an alkali metal coverage in the range of 0.4<θK<1 ML. Carbonate is formed at 220 K via the Boudouard process CO+CO→CO2+C and reaction with oxygen. Further annealing to 470 K results in decomposition of the carbonate with graphitic C and O atoms left on the surface. The evidence comes from synchrotron radiation-based measurements of the valence band electron energy distributions and high-resolution measurements of the K, C, and O core levels.
