Electron-stimulated desorption ion angular distribution and low-energy electron diffraction investigation of CF{sub 3}I on Ru(001)
- Ames Lab., IA (United States)
We have investigated the structures of CF{sub 3}I, and its dissociation products, adsorbed on Ru(001) using low-energy electron diffraction and electron-stimulated desorption ion angular distribution (ESDIAD). Atomic iodine forms ({radical}3x{radical}3)R30{degree} islands even at very low coverages. At 70% of saturation and above, a (2 x 2) superstructure formswhich we attribute to a p(2 x 2) unit cell with one CF{sub 3} group and one iodine atom. ESDIAD images show F{sup +} desorbing at normal emission and in three hexagonal patterns. The normal emission is attributed to a tilted configuration of CF{sub 3}(ad) in which on C-F bond is oriented perpendicular to the surface. A small hexagon is attributed to F(ad) on step edges. A large hexagon at low coverages may arise from isolated CF{sub 3}(ad) species possessing C{sub 3v} symmetry. And finally, an intermediate hexagon is attributed to perturbation of the CF{sub 3}(ad) orientation by molecular fragments which result from electron irradiation of physisorbed CF{sub 3}I. 31 refs., 8 figs., 1 tab.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 374460
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 14 Vol. 12; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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