▎ 摘　　要

Atomic carbon on Co(0001), deposited by ethylene decomposition, forms islands with a (root 3 x root 3)R30 degrees structure at low C coverage (similar to 0.2 ML), whereas a high C coverage (0.5 ML, saturation) induces a reconstruction of the cobalt surface. Atomic carbon weakens the adsorption of CO and H-2, but even a saturated atomic carbon layer does not block the surface for adsorption. Carbon carbon coupling, i.e., polymeric carbon formation, was not observed for temperatures