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Normal photoelectron diffraction was used to determine the structure of c(2 x 2) S and c(2 x 2) Se on Ni(011) and of four different overlayers of Se on Ni(111). For c(2 x 2) Se on Ni(011), Se bonds in the hollow site, whereas for c(2 x 2) S on Ni(011), it is difficult to choose between the hollow and the top sites. For both a low coverage, disordered Se overlayer and an annealed p(2 x 2) Se overlayer on Ni(111), Se was found to be situated in those threefold hollow sites which have a vacancy below them in the second layer. In the case of an unannealed p(2 x 2) Se overlayer on Ni(111), the Se is adsorbed in approximately equal amounts in the top and hollow sites.

Normal photoelectron diffraction studies of selenium and sulfur overlayers on Ni(011) and Ni(111)