Journal
SURFACE SCIENCE
Volume 571, Issue 1-3, Pages L311-L318Publisher
ELSEVIER
DOI: 10.1016/j.susc.2004.07.048
Keywords
X-ray standing waves; photoelectron emission; chemisorption; aromatics; silver
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The adsorption of one monolayer of 1,4,5,8-naphthalene-tetracarboxylicacid-dianhydride (NTCDA) on the Ag(111)-surface was studied using the normal incidence X-ray standing waves (XSW) technique. Results regarding two key-issues are presented: Most prominent, the precise adsorbate-substrate bonding distance could be evaluated to 3.02 +/- 0.02 Angstrom (for the relaxed monolayer-structure). This value is significantly smaller than a van der Waals bonding distance and clearly indicates the chemisorptive bonding character. Concordant results were obtained from both O Is photo- and O KLL Auger electron emission. This was enabled by the development of a data analysis procedure-the second issue addressed which takes into account non-dipolar contributions to the photoemission as well as electron-stimulated Auger excitations. The latter effect adds a fraction to the total Auger yield being as high as 50% and hence may be important for any XSW study using Auger signals. (C) 2004 Elsevier B.V. All rights reserved.
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