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Adsorption sites in coadsorption systems determined by photoemission spectroscopy : K and CO coadsorbed on Rh(111)

Strisland, F.; Beutler, A. LU ; Jaworowski, A. J. LU ; Nyholm, R. LU ; Setlik, B.; Heskett, D. and Andersen, J. N. LU (1998) In Surface Science 410(2-3). p.330-343
Abstract

The adsorption sites of coadsorbed K and CO on the Rh(111) surface have been determined using high-resolution core-level spectroscopy, low-energy electron diffraction and site-resolved photoelectron diffraction. For both a (2 × 2)-2CO-1K and a (2√3 × 2√3)-6CO-1K structure, we find that the CO molecules occupy threefold hollow sites and the K atoms on-top sites, contrary to the adsorption sites of K (threefold hollow site) and CO (on-top site below 0.5 monolayers) if adsorbed alone on Rh(111). Deposition of K onto a CO precovered surface is found to induce large shifts towards lower binding energy of the C and O 1s core levels (∼0.7 eV for C 1s and ∼1.5 eV for O 1s). The major part of these shifts is shown to arise from the K-induced... (More)

The adsorption sites of coadsorbed K and CO on the Rh(111) surface have been determined using high-resolution core-level spectroscopy, low-energy electron diffraction and site-resolved photoelectron diffraction. For both a (2 × 2)-2CO-1K and a (2√3 × 2√3)-6CO-1K structure, we find that the CO molecules occupy threefold hollow sites and the K atoms on-top sites, contrary to the adsorption sites of K (threefold hollow site) and CO (on-top site below 0.5 monolayers) if adsorbed alone on Rh(111). Deposition of K onto a CO precovered surface is found to induce large shifts towards lower binding energy of the C and O 1s core levels (∼0.7 eV for C 1s and ∼1.5 eV for O 1s). The major part of these shifts is shown to arise from the K-induced site change of the CO molecules. This finding may be of importance in the interpretation of XPS data of related co-adsorption systems. Finally, it is suggested that the C and O 1s binding energies provide useful fingerprints of the CO adsorption site also for co-adsorption systems. © 1998 Elsevier Science B.V. All rights reserved.

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author
organization
publishing date
type
Contribution to journal
publication status
published
keywords
Co-adsorption, High-resolution core-level photoemission, Photoelectron diffraction
in
Surface Science
volume
410
issue
2-3
pages
14 pages
publisher
Elsevier
external identifiers
  • Scopus:0032140728
ISSN
0039-6028
language
English
LU publication?
yes
id
c62b2acc-a965-46d0-bfec-f542a35c4172
date added to LUP
2016-04-27 16:47:02
date last changed
2016-07-27 09:01:57
@misc{c62b2acc-a965-46d0-bfec-f542a35c4172,
  abstract     = {<p>The adsorption sites of coadsorbed K and CO on the Rh(111) surface have been determined using high-resolution core-level spectroscopy, low-energy electron diffraction and site-resolved photoelectron diffraction. For both a (2 × 2)-2CO-1K and a (2√3 × 2√3)-6CO-1K structure, we find that the CO molecules occupy threefold hollow sites and the K atoms on-top sites, contrary to the adsorption sites of K (threefold hollow site) and CO (on-top site below 0.5 monolayers) if adsorbed alone on Rh(111). Deposition of K onto a CO precovered surface is found to induce large shifts towards lower binding energy of the C and O 1s core levels (∼0.7 eV for C 1s and ∼1.5 eV for O 1s). The major part of these shifts is shown to arise from the K-induced site change of the CO molecules. This finding may be of importance in the interpretation of XPS data of related co-adsorption systems. Finally, it is suggested that the C and O 1s binding energies provide useful fingerprints of the CO adsorption site also for co-adsorption systems. © 1998 Elsevier Science B.V. All rights reserved.</p>},
  author       = {Strisland, F. and Beutler, A. and Jaworowski, A. J. and Nyholm, R. and Setlik, B. and Heskett, D. and Andersen, J. N.},
  issn         = {0039-6028},
  keyword      = {Co-adsorption,High-resolution core-level photoemission,Photoelectron diffraction},
  language     = {eng},
  month        = {08},
  number       = {2-3},
  pages        = {330--343},
  publisher    = {ARRAY(0xa4c7bf0)},
  series       = {Surface Science},
  title        = {Adsorption sites in coadsorption systems determined by photoemission spectroscopy : K and CO coadsorbed on Rh(111)},
  volume       = {410},
  year         = {1998},
}