Abstract
The vibrational spectra of intermediates formed in the low-pressure oxidation of SO/sub 2/ on the Ag(110) surface are investigated by electron energy loss vibrational spectroscopy. Sulfur dioxide first reacts with atomic oxygen on the Ag(110) surface at 241 K to form a SO/sub 3/ intermediate which is bonded to the surface by a single oxygen atom. This species irreversibly converts to a bidentate, oxygen-bonded species upon heating to 418 K. The SO/sub 3/ species disproportionates at 500 K to yield gaseous SO/sub 2/, adsorbed SO/sub 4/, and subsurface oxygen. The SO/sub 4/ is initially formed as a bi- or tridentate, oxygen-bonded species with C/sub s/ symmetry; it converts to a strictly bidentate species with C/sub 2nu/ symmetry upon heating to 815 K. The SO/sub 4/ decomposes above 873 K.
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