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• W2024199544 startingPage "5965" @default.
• W2024199544 abstract "The vibrational characteristics of H atoms on Si surfaces were investigated by infrared spectroscopy while surface electric fields were controlled on several vicinal (111) surfaces. These surfaces were prepared in solution. By analyzing the response to the electric fields, the orientation of the dynamic polarizations, Pdyns, for specific vibration modes such as Si–H stretching and wagging were determined. These vibration modes are associated with specific bulk-terminated chemisorption sites for H atoms on such surfaces as the top layer of Si atoms of the (111) terrace, the [111̄] micro facet of the [112̄] step edge, and the [001] micro facet of the [1̄1̄2] step edge. The anisotropy of Pdyns also showed that these step edges were atomically straight along [1̄10] and had the translational symmetry of a Si crystal, meaning that these vibrations were not isolated but collective, and thus should be treated as parts of surface phonons. The deduced surface structures confirm previous infrared analyses. The scissoring vibration of dihydride at the [1̄1̄2] step edge, which had been missed previously, was also observed. It was found that the [1̄1̄2] step edge had a strained vertical dihydride and a strained monohydride complex. By adopting a three-layer model with an experimentally determined screening factor when analyzing Pdyns, we concluded that the dihydride was pulled up at an orientation angle of 21° from its bulk-terminated position, in contrast with the other bulk-terminated structures. This is consistent with a Raman result [M. A. Hines et al., J. Chem. Phys. 101, 8055 (1994)] and explains the discrepancy with the previous results of energy loss and infrared spectra regarding the step-edge structure." @default.
• W2024199544 created "2016-06-24" @default.
• W2024199544 creator A5060439850 @default.
• W2024199544 date "1998-04-08" @default.
• W2024199544 modified "2023-10-03" @default.
• W2024199544 title "Chemical structure and surface phonons associated with H on Si" @default.
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• W2024199544 doi "https://doi.org/10.1063/1.476008" @default.
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