Abstract
The intensity of optical second-harmonic generation from Si(111) 7\ifmmode\times\else\texttimes\fi{}7 has been followed during oxygen adsorption using photon energies between 1.17 and 2.34 eV. Previously, dangling-bond surface state resonances and a so-called strain resonance have been found in this range. The influence of oxygen adsorption on these resonances has been investigated. It is found that the surface-state resonances decay with oxygen exposure while the main effect on the strain resonance is a broadening of the spectral peak. The combination of these effects leads to a minimum in the signal versus exposure which is displaced with photon energy. \textcopyright{} 1996 The American Physical Society.
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