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- W2018966925 abstract "The room temperature adsorption and the thermal reaction of acetylene on the $mathrm{Si}(111)ensuremath{-}(7ifmmodetimeselsetexttimesfi{}7)$ surface has been investigated by means of ultraviolet-photoemission spectroscopy and high-resolution electron-energy-loss spectroscopy (HREELS). In the first stage of the adsorption process, the evolution of the restatom- and adatom-related electronic states as a function of acetylene exposure is well described by a modified di-ensuremath{sigma}-bonding model, in which the metallic character of the $(7ifmmodetimeselsetexttimesfi{}7)$ surface plays a fundamental role. For higher exposure, all the restatom dangling bonds are saturated and the adsorption process continues through saturation of the remaining adatoms. In this phase, a molecular tilting is observed, possibly accompanied by a surface atom rearrangement. Upon annealing to $600ifmmode^circelsetextdegreefi{}mathrm{C},$ acetylene dehydrogenation and partial desorption occur, as demonstrated by the disappearance of the C-H modes in HREELS and the reappearance of the adatom and restatom dangling-bond states in valence-band spectra. At $700ifmmode^circelsetextdegreefi{}mathrm{C}$ the formation of a Si-C compound is observed. Atomic-force-microscopy topographic images taken ex situ after annealing to $800ifmmode^circelsetextdegreefi{}mathrm{C}$ show that the Si-C interface is constituted by islands with lateral dimension of $ensuremath{sim}300 AA{},$ while the overall surface roughness is $10--20 AA{}.$" @default.
- W2018966925 created "2016-06-24" @default.
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- W2018966925 date "2001-09-18" @default.
- W2018966925 modified "2023-10-10" @default.
- W2018966925 title "Acetylene adsorption on the<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>111</mml:mn><mml:mo>)</mml:mo><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mn>7</mml:mn><mml:mn /><mml:mo>×</mml:mo><mml:mn>7</mml:mn><mml:mo>)</mml:mo></mml:math>surface: Ultraviolet photoemission and high-resolution electron-energy-loss spectroscopies" @default.
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- W2018966925 doi "https://doi.org/10.1103/physrevb.64.155305" @default.
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