Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 52, Pages 21713-21720Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp906614e
Keywords
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Funding
- NSF [CHE-0616737, CHE-0911454, CHE-0827634]
- University of Texas at Dallas
- William M. LeSuer Fellowship
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0911454, 0911197] Funding Source: National Science Foundation
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In this work, the vibrations of mixed coverage Si(111)-H/Cl surfaces are determined using quantum chemical calculations and Fourier transform infrared spectroscopy. The structure and symmetry considerations of the modes are used to assign the vibrational frequencies for varying coverages of both hydrogen and chlorine on the surface. Significant shifts in the Si-H and Si-Cl stretching frequencies are found as a function of coverage, while the bending modes are shifted very slightly. Our results suggest that Si-H stretching shifts can be used as a probe for chlorine coverage during the reaction of chlorine precursors with the hydrogen-terminated Si(111) surface. Finally, all analysis of coverage dependence suggests that a chemical inductive effect is the dominant origin Of the resulting stretching frequency shifts, though a small contribution from the lone pairs interacting with the Surface is also possible.
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