Abstract
Molecular beam scattering measurements have been conducted to examine the adsorption dynamics of CO 2 on Cu(1 1 0). The initial adsorption probability, S 0, decreases exponentially from 0.43 ± 0.03 to a value close to the detection limit (∼0.03) within the impact energy range of E i = (0.12–1.30) eV. S 0 is independent of the adsorption temperature, T s, and the impact angle, α i, i.e., the adsorption is non-activated and total energy scaling is obeyed. The coverage, Θ, dependent adsorption probability, S( Θ), agrees with precursor-assisted adsorption dynamics (Kisliuk type) above T s ∼ 91 K. However, below that temperature adsorbate-assisted adsorption ( S increases with Θ) has been observed. That effect is most distinct at large E i and low T s. The S( Θ) data have been modeled by Monte Carlo simulations. No indications of CO 2 dissociation were obtained from Auger Electron Spectroscopy or the molecular beam scattering data.
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