Abstract
Surface infrared absorption spectroscopy and density functional cluster calculations are used to definitively demonstrate that the Si-Si dimer bond is the target for the initial insertion of oxygen into the Si(100)-- $(2\ifmmode\times\else\texttimes\fi{}1)$ surface, following ${\mathrm{H}}_{2}\mathrm{O}$ exposure and annealing. This reaction, in turn, facilitates the subsequent incorporation of O into the Si backbonds, thereby promoting (local) oxidation.
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