Abstract
The authors present a high-resolution core-level photoemission study of a Fe3O4(100) surface exposed to 50L (1L=10−6mbars) of H2O and 50L of SO2. S 2p core-level spectra reveal the presence of SO3 and SO4 species. An additional peak in the Fe 3p core-level spectrum shows that they bond with iron from the substrate. Complementary scanning tunneling microscopy of the same surface demonstrates formation of a long-range ordered sulfate locked in the (2×2)R45°-surface potential.
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