Single crystal RuO2 (110): Surface structure*

Abstract The surface structure of RuO 2 (110) has been studied with LEED, AES and XPS. The “as-grown” surface shows no LEED patterns and both AES and XPS indicate that the surface is depleted in oxygen in high vacuum. After extensive annealing in an O 2 atmosphere reproducible LEED patterns characteristic of the (110) surface were obtained. For the well-ordered surface the oxygen XPS results revealed oxygen associated with the bulk RuO 2 , the presence of RuO 3 and oxygen bound to surface atoms.