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Journal of Chemical Physics / Volume 119 / Issue 23 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 119, 12503 (2003); http://dx.doi.org/10.1063/1.1625641 (7 pages)

Core level spectroscopy and reactivity of coadsorbed K+O layers on reconstructed Rh(110) surfaces

S. Günther1,2, H. Marbach3,4, R. Imbihl1, A. Baraldi5, S. Lizzit6, and M. Kiskinova6

1Institute für Physikalische Chemie und Elektrochemie, Universität Hannover, Callinstr. 3-3a, D-30167 Hannover, Germany
2Sincrotrone Trieste, Area Science Park-Basovizza, I-34012 Trieste, Italy
3Institut für Physikalische Chemie und Elektrochemie, Universität Hannover, Callinstr. 3-3a, D-30167 Hannover, Germany
4Surface Science Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
5Dipartimento di Fisica, Universita di Trieste and Laboratorio TASC-INFM, Trieste, Italy
6Sincrotrone Trieste, Area Science Park-Basovizza, 1-34012 Trieste, Italy

(Received 29 May 2003; accepted 18 September 2003)

The bonding character of oxygen and potassium and the interactions in K+O coadsorbed layers on a Rh(110) surface have been studied by means of high resolution x-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). The Rh 3d5/2, K 2p, and O 1s spectra and LEED patterns were used as fingerprints for the interfacial reactions and the structural changes. Dramatic changes in the chemical state of the substrate occur in the presence of dense K+O adlayers, when the oxygen coverage exceeds one monolayer. The effect of coadsorbed potassium on the “reactivity” of oxygen was probed by following the evolution of the O 1s spectra during titration with H2. The enhanced surface capacity for oxygen adsorption and the reduced rate of H2O formation with increasing K coverage were discussed considering the influence of K on the dissociative adsorption of O2 and H2 and on the bonding of the coadsorbed species. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

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KEYWORDS and PACS

Keywords

rhodium, oxygen, potassium, core levels, X-ray photoelectron spectra, low energy electron diffraction, adsorbed layers

PACS

  • 79.60.Dp

    Adsorbed layers and thin films

  • 68.43.-h

    Chemisorption/physisorption: adsorbates on surfaces

  • 61.05.jh

    Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1625641

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    E. Vesselli, C. Africh, A. Baraldi, G. Comelli, F. Esch, and R. Rosei, J. Chem. Phys. 114, 4221 (2001)JCPSA6000114000009004221000001.

    S. Günther, H. Marbach, R. Hoyer, R. Imbihl, L. Gregoratti, A. Barinov, and M. Kiskinova, J. Chem. Phys. 117, 2923 (2002)JCPSA6000117000006002923000001.

    J. Hasselström, A. Föhlisch, R. Denecke, F. M. F. de Groot, and A. Nilsson, Phys. Rev. B 62, 11192 (2000).

    M. V. Ganduglia-Pirovano, M. Scheffler, A. Baraldi, S. Lizzit, G. Comelli, G. Paolucci, and R. Rosei, Phys. Rev. B 63, 205415 (2001).

    M. V. Ganduglia-Pirovano, K. Reuter, and M. Scheffler, Phys. Rev. B 65, 245426 (2002).


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