Unenhanced, non-resonant Raman spectra of a H-terminated vicinal Si(111) surface, Si[6(111)-(112)], with dihydride-terminated bilayer steps have been measured. All four SiH stretches (and a ≈4% ML kink-defect mode) can be observed if both the excitation and detection geometries are favorable. A method for extracting the orientation of adsorbates using polarized, angle-resolved Raman scattering is presented. Assuming the C1 mode corresponds to a localized SiH stretch, the step dihydride is found to be rotated 37 ± 4° away from the surface normal. This value is in agreement with recent ab initio cluster calculations.
|Number of pages||9|
|Journal||Journal of Electron Spectroscopy and Related Phenomena|
|Publication status||Published - Dec 12 1993|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Atomic and Molecular Physics, and Optics
- Surfaces and Interfaces