The valence of gold clusters grown on various alkali halide (100) surfaces have been investigated by X-ray photoelectron spectrometry. For clusters with diameters below about 40 AA, i.e. containing less than approximately 10 3 atoms, no matter what substrate, a band narrowing and a shift to higher binding energies relative to the bulk is observed. These modifications provide evidence for an infinite-finite system transition.
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Roulet et al. (1980) studied this question.
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