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2-Butyne on Si(001) at room temperature: An XPS and NEXAFS study

Bournel, F.; Gallet, J. -J.; Rochet, F.; Hennies, Franz LU ; Silly, M. and Sirotti, F. (2011) In Journal of Electron Spectroscopy and Related Phenomena 184(3-6). p.323-326
Abstract
We present here a study of the adsorption of 2-butyne (CH3-C equivalent to C-CH3) on the Si(0 01)-2 x 1 silicon surface at room temperature using synchrotron radiation photoemission spectroscopy (XPS) and X-ray absorption spectroscopy (NEXAFS). In particular, the Si2p and C1s core levels were followed by real-time photoemission (measuring while dosing). The intensity of the Si2p surface state component gradually diminishes with an increasing exposure to the gas. The C1s photoemission line is decomposed into two main components with their vibrational series, attributed to the two inner carbons (bonded to silicon) and the two methyl carbons (protruding into the vacuum), respectively. C1s real-time XPS indicates that the chemical bonding of... (More)
We present here a study of the adsorption of 2-butyne (CH3-C equivalent to C-CH3) on the Si(0 01)-2 x 1 silicon surface at room temperature using synchrotron radiation photoemission spectroscopy (XPS) and X-ray absorption spectroscopy (NEXAFS). In particular, the Si2p and C1s core levels were followed by real-time photoemission (measuring while dosing). The intensity of the Si2p surface state component gradually diminishes with an increasing exposure to the gas. The C1s photoemission line is decomposed into two main components with their vibrational series, attributed to the two inner carbons (bonded to silicon) and the two methyl carbons (protruding into the vacuum), respectively. C1s real-time XPS indicates that the chemical bonding of the molecule does not change from low coverage to saturation coverage. NEXAFS spectroscopy performed at the C K-edge using linearly polarized radiation reveals the presence of a pi*(C=C) molecular orbital parallel to the surface, resulting from the opening of the triple C equivalent to C bond and the formation of two sigma(Si-C) bonds. The attachment of the molecule via C-H bond scission (conserving the CC bond) is excluded. The clear-cut observation of a C=C bond, combined to our preceding angle-resolved UV photoemission spectroscopy (ARUPS) work [Bournel et al., Surf. Sci. 601 (2007) 3750] favors the on-dimer adsorption model at saturation (similar to 3 L). (C) 2010 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Si(001), XPS, NEXAFS, 2-Butyne, Adsorption
in
Journal of Electron Spectroscopy and Related Phenomena
volume
184
issue
3-6
pages
323 - 326
publisher
Elsevier
external identifiers
  • wos:000292173400055
  • scopus:79957622757
ISSN
0368-2048
DOI
10.1016/j.elspec.2010.12.026
language
English
LU publication?
yes
id
287dac61-2eb3-4179-976c-f0d3dcd088a1 (old id 2032266)
date added to LUP
2011-07-26 15:13:54
date last changed
2017-01-01 05:33:07
@article{287dac61-2eb3-4179-976c-f0d3dcd088a1,
  abstract     = {We present here a study of the adsorption of 2-butyne (CH3-C equivalent to C-CH3) on the Si(0 01)-2 x 1 silicon surface at room temperature using synchrotron radiation photoemission spectroscopy (XPS) and X-ray absorption spectroscopy (NEXAFS). In particular, the Si2p and C1s core levels were followed by real-time photoemission (measuring while dosing). The intensity of the Si2p surface state component gradually diminishes with an increasing exposure to the gas. The C1s photoemission line is decomposed into two main components with their vibrational series, attributed to the two inner carbons (bonded to silicon) and the two methyl carbons (protruding into the vacuum), respectively. C1s real-time XPS indicates that the chemical bonding of the molecule does not change from low coverage to saturation coverage. NEXAFS spectroscopy performed at the C K-edge using linearly polarized radiation reveals the presence of a pi*(C=C) molecular orbital parallel to the surface, resulting from the opening of the triple C equivalent to C bond and the formation of two sigma(Si-C) bonds. The attachment of the molecule via C-H bond scission (conserving the CC bond) is excluded. The clear-cut observation of a C=C bond, combined to our preceding angle-resolved UV photoemission spectroscopy (ARUPS) work [Bournel et al., Surf. Sci. 601 (2007) 3750] favors the on-dimer adsorption model at saturation (similar to 3 L). (C) 2010 Elsevier B.V. All rights reserved.},
  author       = {Bournel, F. and Gallet, J. -J. and Rochet, F. and Hennies, Franz and Silly, M. and Sirotti, F.},
  issn         = {0368-2048},
  keyword      = {Si(001),XPS,NEXAFS,2-Butyne,Adsorption},
  language     = {eng},
  number       = {3-6},
  pages        = {323--326},
  publisher    = {Elsevier},
  series       = {Journal of Electron Spectroscopy and Related Phenomena},
  title        = {2-Butyne on Si(001) at room temperature: An XPS and NEXAFS study},
  url          = {http://dx.doi.org/10.1016/j.elspec.2010.12.026},
  volume       = {184},
  year         = {2011},
}