Abstract
The experimental results of the adsorption of CO on clean and potassium-modified vicinal Cu(100) surfaces at 125 K were present. We studied three surfaces under identical experimental conditions. At 125 K, potassium forms disordered structure on vicinals and CO adsorbs only on sites not occupied by K. It was found that a small percent of the CO molecules dissociate on the stepped interfaces. The influence of steps dominates over pre-adsorbed alkali atoms at 125 K. Low temperature adsorption of CO on stepped and K-modified Cu surfaces was studied. At CO saturation, the 4σ intensity ( I ) follow the order: I (100) > I (119) > I (115) for both the clean and K-modified surfaces.
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