Determination of surface geometries from angular distributions of deep-core-level X-ray photoelectrons

Significant anisotropies are found in deep-core-level X-ray photoemission from adsorbates, specifically c(2 × 2)O on Cu(001) and c(2 × 2)CO on Ni(001). The magnitudes are approximately I maximum/ I background = 1.3–1.5. These effects are found to be due to low-angle surface scattering for O 1s emiss...

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Bibliographic Details
Published in:Surface science 1979, Vol.89 (1), p.52-63
Main Authors: Fadley, C.S., Kono, S., Petersson, L.-G., Goldberg, S.M., Hall, N.F.T., Lloyd, J.T., Hussain, Z.
Format: Article
Language:English
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Summary:Significant anisotropies are found in deep-core-level X-ray photoemission from adsorbates, specifically c(2 × 2)O on Cu(001) and c(2 × 2)CO on Ni(001). The magnitudes are approximately I maximum/ I background = 1.3–1.5. These effects are found to be due to low-angle surface scattering for O 1s emission from adsorbed O and intra-molecular forward scattering for C 1s emission from CO. A single-scattering theoretical model is found to well predict the observed effects, and this permits deriving new information concerning the bonding geometries of these adsorbates: that c(2 × 2)O has a fourfolf, in-plane geometry on Cu(001) and that c(2 × 2)CO has an average orientation within 12° of normal on Ni(001). The general use of such measurements for surface structural determinations is thus suggested.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(79)90592-2