By combining scanning tunneling microscopy (STM) and ultraviolet photoelectron spectroscopy, we show that the adsorption of single O₂ molecules on Si(111)-(7 × 7) produces essentially molecular sites, seen as bright individual sites in STM topographs, which are stable at room temperature. Atom-resolved STM studies also reveal that these molecular sites react very efficiently with further O₂ and H₂O molecules. This is shown to account for the saturation at low exposure of the molecular site density and for the apparent decay lifetime of these molecular sites.
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Dujardin et al. (1996) studied this question.
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