K and mixed K+O adlayers on Rh(110)

S. Günther, R. Hoyer, H. Marbach, R. Imbihl, F. Esch, C. Africh, G. Comelli, M. Kiskinova

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The evolution of the structure of the adlayers and the substrate during adsorption of K and coadsorption of K and O on Rh(110) is studied by scanning tunneling microscopy and low-energy electron diffraction. The K adsorption at temperature above 450 K leads to consecutive (1×4), (1×3), and (1×2) missing-row reconstructions for coverage up to 0.12 ML, which revert back to (1×3) and (1×4) with increasing coverage up to 0.21 ML. The coadsorption of different oxygen amount at T>450 K and eventually following reduction-reoxidation cycles led to a wealth of coadsorbate structures, all involving substrate missing-row-type reconstructions, some including segmentation of Rh rows along the [110] direction. The presence of K stabilizes the (1×2) missing-row reconstruction, which facilitates the formation of a great variety of very open (10×2)-type reconstructions at high oxygen coverage, not observed in the single adsorbate systems.

Original languageEnglish
Article number014706
JournalJournal of Chemical Physics
Issue number1
StatePublished - 2006
Externally publishedYes


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