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Experimental and theoretical study of oxygen adsorption structures on Ag(111)
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- Schnadt, Joachim (author)
- Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
- Knudsen, Jan (author)
- Hu, Xiao Liang (author)
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- Michaelides, Angelos (author)
- Vang, Ronnie T. (author)
- Reuter, Karsten (author)
- Li, Zheshen (author)
- Laegsgaard, Erik (author)
- Scheffler, Matthias (author)
- Besenbacher, Flemming (author)
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- (creator_code:org_t)
- 2009
- 2009
- English.
- In: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 80:7
- Journal article (peer-reviewed)
Abstract
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- The oxidized Ag(111) surface has been studied by a combination of experimental and theoretical methods, scanning tunneling microscopy, x-ray photoelectron spectroscopy, and density functional theory. A large variety of different surface structures is found, depending on the detailed preparation conditions. The observed structures fall into four classes: (a) individually chemisorbed atomic oxygen atoms, (b) three different oxygen overlayer structures, including the well-known p(4x4) phase, formed from the same Ag-6 and Ag-10 building blocks, (c) a c(4x8) structure not previously observed, and (d) at higher oxygen coverages structures characterized by stripes along the high-symmetry directions of the Ag(111) substrate. Our analysis provides a detailed explanation of the atomic-scale geometry of the Ag-6/Ag-10 building block structures and the c(4x8) and stripe structures are discussed in detail. The observation of many different and co-existing structures implies that the O/Ag(111) system is characterized by a significantly larger degree of complexity than previously anticipated, and this will impact our understanding of oxidation catalysis processes on Ag catalysts.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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- Li, Zheshen
- Laegsgaard, Erik
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