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Vibrational properties of Na nanoclusters self-assembled on Si(1 1 1) surface

Vibrational properties of Na nanoclusters self-assembled on Si(1 1 1) surface,10.1016/j.susc.2008.05.011,Surface Science,C. G. Hwang,N. D. Kim,S. Y. S

Vibrational properties of Na nanoclusters self-assembled on Si(1 1 1) surface  
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We have investigated structural and vibrational properties of Na nanoclusters self-assembled on the Si(111)-7×7 surface at room temperature mainly using high-resolution electron-energy-loss spectroscopy. We observe three characteristic loss peaks L1, L2, and L3 ascribed to an interband transition, a local atomic vibration, and another interband transition from an Na nanocluster-induced state, respectively. The spectral change of L1 with Na coverage θ suggests that the S1 dangling bond band is gradually filled up to open a band gap with increasing θ up to 1.1eV when all three loss peaks completely disappeared. The relatively high loss energy El=243meV of L2 with a narrow linewidth of 32meV indicates the only Na–Si atomic vibrational mode with Na atoms occupying the tilted on-top sites above Si rest atoms. Furthermore the extremely weak loss peak L3 visible at a coverage range unique only to the Na nanoclusters proves the presence of a Na nanoclusters-induced electronic state N2. These observations provide explanation to most unresolved spectral behavior of earlier photoemission study and evidence for the atomic structure of the Na nanocluster.
Journal: Surface Science - SURFACE SCI , vol. 602, no. 13, pp. 2300-2304, 2008
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