Details
| Original language | English |
|---|---|
| Pages (from-to) | 443-454 |
| Number of pages | 12 |
| Journal | Surface Science |
| Volume | 529 |
| Issue number | 3 |
| Publication status | Published - 6 Mar 2003 |
Abstract
We determined the local adsorption structure of disordered oxygen on the Ni(111) surface by means of diffuse holographic LEED. The measurements have been performed above the critical temperature (Tc=450 K) for the oxygen order-disorder phase transition at 500 K and at a coverage of Θ=0.25 ML. At this temperature we found, in agreement with a previous LEED-IV-analysis [Surf. Sci. 349 (1996) 185], that besides the fcc threefold sites also hcp sites are occupied. In addition, a small amount seems to be located also at top and bridge sites. Reconstructing the holographic wavefield information, the different oxygen adsorption geometries are superimposed in the real space image. Nevertheless, a spatial resolution of 0.5-1 Å was sufficient to clearly distinguish between them. The influence of algorithmic parameters on the image quality was tested.
Keywords
- Adsorption kinetics, Low energy electron diffraction (LEED), Nickel, Oxygen, Photoelectron holography
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface Science, Vol. 529, No. 3, 06.03.2003, p. 443-454.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Holographic diffuse LEED image reconstruction for simultaneous occupation of different oxygen adsorption sites on Ni(1 1 1)
AU - Kolthoff, D.
AU - Schwennicke, C.
AU - Pfnür, Herbert
N1 - Funding information: This work was supported by the Deutsche Forschungsgemeinschaft and by the Volkswagen Stiftung.
PY - 2003/3/6
Y1 - 2003/3/6
N2 - We determined the local adsorption structure of disordered oxygen on the Ni(111) surface by means of diffuse holographic LEED. The measurements have been performed above the critical temperature (Tc=450 K) for the oxygen order-disorder phase transition at 500 K and at a coverage of Θ=0.25 ML. At this temperature we found, in agreement with a previous LEED-IV-analysis [Surf. Sci. 349 (1996) 185], that besides the fcc threefold sites also hcp sites are occupied. In addition, a small amount seems to be located also at top and bridge sites. Reconstructing the holographic wavefield information, the different oxygen adsorption geometries are superimposed in the real space image. Nevertheless, a spatial resolution of 0.5-1 Å was sufficient to clearly distinguish between them. The influence of algorithmic parameters on the image quality was tested.
AB - We determined the local adsorption structure of disordered oxygen on the Ni(111) surface by means of diffuse holographic LEED. The measurements have been performed above the critical temperature (Tc=450 K) for the oxygen order-disorder phase transition at 500 K and at a coverage of Θ=0.25 ML. At this temperature we found, in agreement with a previous LEED-IV-analysis [Surf. Sci. 349 (1996) 185], that besides the fcc threefold sites also hcp sites are occupied. In addition, a small amount seems to be located also at top and bridge sites. Reconstructing the holographic wavefield information, the different oxygen adsorption geometries are superimposed in the real space image. Nevertheless, a spatial resolution of 0.5-1 Å was sufficient to clearly distinguish between them. The influence of algorithmic parameters on the image quality was tested.
KW - Adsorption kinetics
KW - Low energy electron diffraction (LEED)
KW - Nickel
KW - Oxygen
KW - Photoelectron holography
UR - http://www.scopus.com/inward/record.url?scp=0037430869&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(03)00306-6
DO - 10.1016/S0039-6028(03)00306-6
M3 - Article
AN - SCOPUS:0037430869
VL - 529
SP - 443
EP - 454
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 3
ER -