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Title of article :
The structure of methoxy species on Cu(110): A combined photoelectron diffraction and density functional theory determination
Author/Authors :
Kreikemeyer Lorenzo، نويسنده , , D. and Bradley، نويسنده , , M.K. and Unterberger، نويسنده , , W. Jack Duncan، نويسنده , , D.A. and Lerotholi، نويسنده , , T.J. and Robinson، نويسنده , , J. Donald Woodruff، نويسنده , , D.P.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2011
Pages :
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Abstract :
The local structure of the methoxy species on Cu(110) has been investigated experimentally using chemical-state specific O 1s scanned-energy mode photoelectron diffraction (PhD), and also by density functional theory (DFT) calculations. The PhD data show a clear preference for adsorption with the O bonding atoms in short-bridge sites, though the best fit of multiple-scattering simulations to the experimental data is achieved with two slightly different short-bridge geometries. The DFT calculations also show that not only are the short-bridge sites energetically favoured in isolation, but that coordination to pairs of Cu adatoms has a similar energy. A structure consistent with both the PhD data and the DFT calculations is proposed for the previously-observed (5 × 2)pg ordered phase, based on methoxy species in short-bridge sites on pairs of Cu adatoms and on the underlying surface. Simulated scanning tunnelling microscopy images agree well with those observed experimentally, while the model is also shown to be consistent with the qualitative behaviour seen in early X-ray photoelectron diffraction (XPD) forward-scattering experiments.
Keywords :
surface structure , Copper methanol , Catalysis photoelectron diffraction , Ab initio quantum chemical calculations , Chemisorption
Journal title :
Surface Science
Link To Document :