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Characterization of...
Characterization of the chemisorption of methylsilane on a au(1,1,1) surface from the silicon K- And L-edge spectra : A theoretical study using the four-component static exchange approximation
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- Ekström, Ulf (author)
- Linköpings universitet,Beräkningsfysik,Tekniska högskolan
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- Ottosson, Henrik (author)
- Uppsala universitet,Institutionen för biokemi och organisk kemi,Department of Biochemistry and Organic Chemistry, Uppsala university, Sweden
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- Norman, Patrick (author)
- Linköpings universitet,Beräkningsfysik,Tekniska högskolan
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(creator_code:org_t)
- 2007-08-28
- 2007
- English.
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In: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 111:37, s. 13846-13850
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Abstract
Subject headings
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- X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure spectra (NEXAFS) of methylsilane, isolated and chemisorbed to a Au(1,1,1) surface, are determined in the fully relativistic four-component static exchange approximation - both the K- and the L-edge of silicon are addressed in this investigation. In the fully chemisorbed structure, three H(Si) atoms have been cleaved off when Si binds in the hollow site of Au forming three Si - Au bonds of normal length. As due to die tri-coordinated chemisorption, the onsets of the K- and L-edge NEXAFS absorption bands occur some 2.0 and 2.5 eV lower in energy, respectively. The spin-orbit splittings in the silicon 2p-shell are not significantly changed due to adsorption. A partly chemisorbed methylsilane with only one H(Si) bond cleaved was also studied, and it is shown that the polarization dependence in the surface spectra contains details that can be used experimentally to identify the surface coordination of silicon. The red-shifts in the XPS silicon 1s (2p) spectra upon surface binding are 0.95 (0.65) and 1.15 (0.83) eV for the mono- and tricoordinated system, respectively.
Subject headings
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Chemical bonds
- Chemisorption
- Semiconducting silicon
- X ray absorption spectroscopy
- X ray photoelectron spectroscopy
- Polarization dependence
- Surface binding
- Paraffins
- Chemistry
- NATURAL SCIENCES
Publication and Content Type
- ref (subject category)
- art (subject category)
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