Abstract
The effect of aluminum-oxide clusters on the Al(111) surface on subsequent oxygen adsorption at 300 K was investigated for both low and high degrees of oxidation using x-ray photoelectron spectroscopy and high-resolution electron energy-loss spectroscopy. Oxide clusters on the Al(111) surface were produced by annealing chemisorbed O layers of various coverage up to 773 K. Only the chemisorbed oxygen phase was found to form at 243–300 K after additional O2 exposure on surfaces containing both low- and high-oxide-cluster populations. The chemisorbed O adatoms produced were not influenced by the oxidic phase, exhibiting spectroscopic features similar to those observed upon chemisorption on the clean surface without oxide clusters. Oxygen adsorption on the surface with both low- and high-oxide-cluster populations proceeded with the same rate as found on the clean Al(111) surface. The observed effect is postulated to be due to an increase of the number of the vacant Al adsorption sites liberated upon transformation of chemisorbed O adatoms into oxide clusters.
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