Auger-electron spectroscopy, electron-energy-loss spectroscopy, low-energy electron-diffraction, and thermal-programmed-desorption measurements were performed in order to characterize the effect of small amounts of Na on the Si(111) surface structure and reactivity towards oxygen. We have observed a passivation effect of Na with respect to the oxygen adsorption rate and surface oxidation in the case when Na induces a (7×{}7)-to-(3×{}1) structural transformation of the initial Si(111)7×{}7 surface.
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Tikhov et al. (1991) studied this question.
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