Looking up the down staircase: Surface Raman spectroscopy as a probe of adsorbate orientation

Melissa A. Hines, Timothy D. Harris, Alex Harris, Yves J. Chabal

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)183-191
Number of pages9
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume64-65
Issue numberC
DOIs
Publication statusPublished - Dec 12 1993

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

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