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Infrared spectrosco...
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Gustafsson, Kristian,1972Chalmers tekniska högskola,Chalmers University of Technology
(författare)
Infrared spectroscopy of physisorbed and chemisorbed N-2 in the Pt(111)(3x3)N-2 structure
- Artikel/kapitelEngelska2007
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LIBRIS-ID:oai:gup.ub.gu.se/76830
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https://gup.ub.gu.se/publication/76830URI
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https://doi.org/10.1063/1.2804869DOI
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https://research.chalmers.se/publication/76830URI
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Using infrared spectroscopy and low electron energy diffraction, we have investigated the adsorption of N-2, at 30 K, on the Pt(111) and the Pt(111)(1x1)H surfaces. At monolayer coverage, N-2 orders in commensurate (3x3) structures on both surfaces, and we propose that the unit cells contain four molecules in each case. The infrared spectra reveal that N-2 exclusively physisorbs on the Pt(111)(1x1)H surface, while both physisorbed and chemisorbed N-2 is detected on the Pt(111) surface. Physisorbed N-2 is the majority species in the latter case, and the two adsorption states show an almost identical uptake behavior, which indicates that they are intrinsic constituents of the growing (3x3) N-2 islands. An analysis of the infrared absorbance data, based on a simple scaling concept suggested by density functional theory calculations, supports a model in which the (3x3) unit cell contains one chemisorbed molecule in end-on atop configuration and three physisorbed molecules. We note that a classic ''pinwheel'' structure on a hexagonal lattice, with the end-on chemisorbed N2 molecules acting as ''pins,'' is compatible with this composition. (C) 2007 American Institute of Physics.
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Karlberg, G. S.Danmarks Tekniske Universitet,Technical University of Denmark
(författare)
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Andersson, Stig,1941Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg(Swepub:gu)xandst
(författare)
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Chalmers tekniska högskolaDanmarks Tekniske Universitet
(creator_code:org_t)
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Ingår i:Journal of Chemical Physics: AIP Publishing127:190021-96061089-7690
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