Vibrations at 3C-SiC(001)-(32) surfaces |
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Authors: | H. Nienhaus V. van Elsbergen W. Mönch |
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Affiliation: | Laboratoire Fluides, Automatique et Systèmes Thermiques (UMR CNRS 7608), Batiment 502, Campus universitaire, 91405 Orsay Cedex, France, FR Grupo de Medios Porosos, Facultad de Ingenieria, Buenos-Aires, Argentina, AR Institut de Mécanique des Fluides de Toulouse, avenue du Président Camille Soula, 31400 Toulouse, France, FR Laboratoire “Surface du Verre et Interface”, (UMR CNRS/St. Gobain) 39 quai L. Lefranc, B.P. 135, 93303 Aubervilliers Cedex, France, FR
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Abstract: | Si-terminated 3C-SiC(001) surfaces with () and ()reconstructions were investigated by high-resolution electron energy-loss spectroscopy (HREELS), low-energy electron diffraction (LEED) and Auger electron spectroscopy. The surfaces were prepared by subsequent annealing steps after cleaning by heating in a Si flux. At ()-reconstructed surfaces, the HREELS intensity increases while the widths of the loss lines decrease with proceeding preparation. Eventually, weak loss structures at 380 and 700 cm-1 are detected besides the strong Fuchs-Kliewer phonon loss peaks. They are attributed to surface-localized vibrations, i.e., to stretching modes of on-top Si dimers and of C-Si-C groups, respectively. The weak features vanish after exposure to atomic deuterium, but reappear after subsequent annealing. At () reconstructed surfaces the HREELS lines are broadened and no surface-localized modes were resolved. Received 18 January 1999 |
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Keywords: | PACS. 68.35.Ja Surface and interface dynamics and vibrations - 79.20.-m Impact phenomena (including electron spectra and sputtering) |
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