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• W1978393112 abstract "Using C 1s scanned-energy mode photoelectron diffraction the local adsorption geometry of acetylene on the $mathrm{Si}(100)(2ifmmodetimeselsetexttimesfi{}1)$ surface has been investigated at both low and room temperatures. Clear differences in the data at the two sample temperatures are attributed to the co-occupation of at least two distinct local sites. Quantitative modeling based on a two-site model indicates that the majority state at low temperature is bridge site adsorption with the C-C axis of the acetylene directly above, and parallel to, Si-Si surface dimers. At room temperature a second state accounts for more than 50% of the adsorbed acetylene molecules, and the favored model places these acetylene molecules midway between pairs of Si dimers, although the azimuthal orientation of the C-C axes is ambiguous. One possible geometry for this second species is the ``pedestal site'' tetra-ensuremath{sigma} species previously proposed by Xu et al. [Phys. Rev. Lett. 84, 939 (2000)], although the specific geometry proposed by this group can be excluded. An alternative ``rotated pedestal'' site is comparably probable. There is no direct evidence for any occupation of a rotated bridge site across the ends of two adjacent Si dimers, but partial occupation of this site cannot be excluded." @default.
• W1978393112 created "2016-06-24" @default.
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• W1978393112 date "2002-08-30" @default.
• W1978393112 modified "2023-09-24" @default.
• W1978393112 title "Local adsorption geometry of acetylene on<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Si</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>100</mml:mn><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mn /><mml:mo>×</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mo>:</mml:mo></mml:math>Multiple sites and the role of substrate temperature" @default.
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• W1978393112 doi "https://doi.org/10.1103/physrevb.66.085333" @default.
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