A rich menagerie of structures is identified at 5 K following adsorption of low coverages (≤0.05 monolayers) of S on Cu(111) at room temperature. This paper emphasizes the reconstructions at the steps. The A-type close-packed step has 1 row of S atoms along its lower edge, where S atoms occupy alternating pseudo-fourfold-hollow (p4fh) sites. Additionally, there are 2 rows of S atoms of equal density on the upper edge, bridging a row of extra Cu atoms, together creating an extended chain. The B-type close-packed step exhibits an even more complex reconstruction, in which triangle-shaped groups of Cu atoms shift out of their original sites and form a base for S adsorption at (mostly) 4fh sites. We propose a mechanism by which these triangles could generate Cu–S complexes and short chains like those observed on the terraces.
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21 May 2015
Research Article|
May 21 2015
Reconstruction of steps on the Cu(111) surface induced by sulfur
Holly Walen;
Holly Walen
a)
1Department of Chemistry,
Iowa State University
, Ames, Iowa 50011, USA
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Da-Jiang Liu;
Da-Jiang Liu
2
Ames Laboratory of the USDOE
, Ames, Iowa 50011, USA
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Junepyo Oh;
Junepyo Oh
3
RIKEN Surface and Interface Science Laboratory
, Wako, Saitama 351-0198, Japan
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Hyunseob Lim;
Hyunseob Lim
b)
3
RIKEN Surface and Interface Science Laboratory
, Wako, Saitama 351-0198, Japan
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J. W. Evans;
J. W. Evans
2
Ames Laboratory of the USDOE
, Ames, Iowa 50011, USA
4Department of Physics and Astronomy,
Iowa State University
, Ames, Iowa 50011, USA
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Yousoo Kim;
Yousoo Kim
3
RIKEN Surface and Interface Science Laboratory
, Wako, Saitama 351-0198, Japan
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P. A. Thiel
P. A. Thiel
1Department of Chemistry,
Iowa State University
, Ames, Iowa 50011, USA
2
Ames Laboratory of the USDOE
, Ames, Iowa 50011, USA
5Department of Materials Science and Engineering,
Iowa State University
, Ames, Iowa 50011, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: hwalen@iastate.edu
b)
Current address: Ulsan National Institute of Science and Technology, South Korea.
J. Chem. Phys. 142, 194711 (2015)
Article history
Received:
February 18 2015
Accepted:
May 06 2015
Citation
Holly Walen, Da-Jiang Liu, Junepyo Oh, Hyunseob Lim, J. W. Evans, Yousoo Kim, P. A. Thiel; Reconstruction of steps on the Cu(111) surface induced by sulfur. J. Chem. Phys. 21 May 2015; 142 (19): 194711. https://doi.org/10.1063/1.4921258
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