Pd (100) with mesoscopic defects was prepared, and oxygen adsorption on thi
s surface was studied by photoemission electron microscopy (PEEM). The defe
ct surfaces behaved differently towards oxygen adsorption from the Pd (100)
surface. Besides the oxygen species adsorbed on the surface, the formation
of surface oxide and subsurface oxygen on different facets, as well as sur
face restructure, was observed by PEEM during oxygen adsorption. (C) 2000 E
lsevier Science B.V. All rights reserved.