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The structures, energies and electronic properties of the adatom vacancies on the Si(111)-(7x7) surface are studied by tight-binding molecular dynamics calculations using the recently developed environment-dependent potential of silicon. Adatom vacancies on the edge of the (7x7) unit cell are found to have formation energies lower than those on the corner of the unit cell by about 0.1eV. Structure...
The effect of low-energy sputtering on the surface electronic structure of Cu(110) was studied under room temperature conditions by means of reflection-anisotropy spectroscopy (RAS) at photon energies between 1.6 and 6eV. Sputtering times varied from 0 to 60min, and the energy of the Ar + ions was 500eV. Spectral changes that depended on fluence in a reproducible manner were observed. We argue...
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