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

doi:10.1016/0368-2048(93)80078-Z

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

Brookhaven National Laboratory

Research output: Contribution to journal › Article › peer-review

28 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 language	English
Pages (from-to)	183-191
Number of pages	9
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	64-65
Issue number	C
DOIs	https://doi.org/10.1016/0368-2048(93)80078-Z
Publication status	Published - 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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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.",

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AU - Chabal, Yves J.

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AB - 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.

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