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Abstract
In a previous study of CO adsorption on a number of metals, a comparison of static SIMS with surface coverage data from the literature revealed a linear relationship between CO coverage and the sum of the secondary ion peak intensity ratios (MCO+/M+ + M2CO+/M2+) in the coverage region below the onset of compression. In an extension of this work to the CO/Ru(001) system, a comparison of static SIMS with surface coverage data, θθmax derived from TPD measurements, is made. At coverages below θ/θmax ∼ 0.6 a linear relationship between CO coverage and the sum of the intensity ratios (RuCO+/Ru+ + Ru2CO+/Ru2+) is observed. This appears to correspond to the filling of the initial β3, TPD state and the development of the (√3 × √3)R 30° LEED pattern reported in the literature. Above θ/θmax ∼ 0.6 a break in the relationship occurs apparently corresponding to the development of the second, β2, TPD state and disordering of the adlayer as evidenced by the disappearance of the √3 LEED pattern. The relationship is used to compare isosteric heats of adsorption, derived from SIMS intensity ratio isobars, with activation energies for desorption from TPD. Good agreement is found between these results and the corresponding values from the literature.
Published Version
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