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Room temperature adsorption of K either on Si(111)-7×7 or on dielectric SiO 2 -covered Si(111) followed by second-harmonic generation (SHG) observation clearly identified a characteristic resonance enhancement typical to Si(111)-7×7. The polarization selected SHG as a function of coverage obtained at different photon energies between 1.17-eV and 1.55-eV show a similar variation of the SH intensity...
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