The effect of the sulphur-induced reconstruction of the Pt(S)−[6(111) x (100)] surface on CO adsorption was investigated using thermal desorption spectroscopy. On the unreconstructed surface, desorption states were observed from the (111) terraces and from the high coordinate step edge site. Following the sulphur-induced reconstruction of the surface, a new desorption state, attributed to the upper (100) plane of the two atom high step was observed. Lateral repulsive interactions between S and CO were found to affect the desorption energy on the (111) terrace and the upper face of the (100) step edge. Sulfur-CO or CO-CO interactions did not affect the CO desorption energy from the high coordinate step edge site. Suppression of each CO desorption state appeared to be due to sulfur site blocking, as sulfur coverage was increased.

The Effect of the Sulfur Induced Reconstruction of the Pt(S)−[6(111) x (100)] Surface on CO Adsorption. A.M.Lanzillotto, S.L.Bernasek: Surface Science, 1986, 175[1], 45-54