Abstract
Using x-ray photoelectron spectroscopy (XPS), synchrotron x-ray photoelectron spectroscopy (SXPS), low-energy electron diffraction (LEED), and Fourier- transform infrared absorption spectroscopy (FTIR) we have investigated structure and composition of hydrogen saturated and surfaces. The hydrogen saturated surfaces are clean and unreconstructed. On both surface orientations a hydrogen induced surface core level shift is observed in the C spectra, which is consistent with carbon monohydrides. The identification of a corresponding component in the Si spectra is discussed. On a sharp absorption line due to the stretch mode indicates the presence of silicon monohydrides. Structural models for hydrogen saturated and surfaces are proposed which are consistent with our spectroscopic results. Annealing in ultrahigh vacuum leads to considerable changes in the core level spectra although the surface periodicity remains unchanged at . The thermally induced line shape variations are more prominent in the C spectra than in the Si spectra.
7 More- Received 13 July 2004
DOI:https://doi.org/10.1103/PhysRevB.71.245333
©2005 American Physical Society