Abstract
Low-energy electron diffraction and density-functional theory calculations are used to examine the adsorption properties of CO and ${\mathrm{N}}_{2}$ on ${\mathrm{RuO}}_{2}(110).$ Both molecules adsorb over the coordinatively unsaturated Ru sites (cus-Ru atoms) with their molecular axes normal to the surface plane. The chemisorption mechanism is well described within a donor-acceptor model, i.e., the Blyholder model. Since ${\mathrm{N}}_{2}$ is not reacting with lattice oxygen of ${\mathrm{RuO}}_{2},$ quite in contrast to CO, ${\mathrm{N}}_{2}$ may serve as a chemical, nondestructive probe to titrate but also to selectively block the cus-Ru atoms; recently, the cus-Ru atoms were shown to be the active centers for the chemisorption of molecules.
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