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The interaction of cesium with oxygen

J. Chem. Phys. 86, 2411 (1987); doi:10.1063/1.452089

Issue Date: 15 February 1987

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B. Woratschek, W. Sesselmann, J. Küppers, and G. Ertl
Institut für Physikalische Chemie, Universität München, West Germany

H. Haberland
Fakultät für Physik, University Freiburg, West Germany
Ultraviolet photoelectron spectroscopy (UPS) and electron spectroscopy by deexcitation of metastable noble gas atoms (MDS) were used to follow the continuous oxidation of Cs films. While UPS has a finite information depth, MDS probes only the properties of the outermost atomic layer. Small doses of O2 cause the formation of a ``monolayer'' of Cs11O3 in which the O2− ions are incorporated below the surface, while the surface itself consists merely of metallic Cs atoms. Further uptake of oxygen leads to a continuous transformation of the subsurface layer into Cs2O2, while a small concentration of adsorbed O atoms builds up on the surface which act as nucleation centers for subsurface oxidation. Finally, the surface layer is completely oxidized into CsO2 which then retards further oxygen penetration into the bulk. The chemical state of the surface can be directly correlated with the associated change of the work function. A monolayer of Cs adsorbed on a Cu(110) surface exhibits quite different properties. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 18 August 1986; accepted 6 November 1986
Permalink: http://link.aip.org/link/?JCPSA6/86/2411/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical chemistry Surface processes Heterogeneous catalysis at surfaces and other surface reactions
  • 79.60.Cn
    Electron and ion emission by liquids and solids; impact phenomena Photoemission and photoelectron spectra Clean metals
  • YEAR: 1987

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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AIP is a member of CrossRef AIP

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