Oxygen adsorption and ordering on Ru(10(1)over-bar-0) - art. no. 115410

The dissociative oxygen chemisorption on the Ru(10 (1) over bar0) surface h as been studied by monitoring the changes of the O 1s and Ru 3d(5/2) core l evels and by measuring the evolution of the diffraction pattern during oxyg en exposure at 270 K. The sensitivity of core level binding energies to dif ferent geometrical configurations, together with the measurements of the ox ygen-induced diffraction spot profile along the [0001] and [1 (2) over bar 10] directions, permit us to follow the details of formation of the c(2x4) and the (2x1)p2mg ordered structures.