An electron-stimulated desorption ion angular distribution and low-energy electron diffraction investigation of CF3I on Ru(001)
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The Department of Chemistry seeks to provide students with a foundation in the fundamentals and application of chemical theories and processes of the lab. Thus prepared they me pursue careers as teachers, industry supervisors, or research chemists in a variety of domains (governmental, academic, etc).
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The Department of Chemistry was founded in 1880.
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1880-present
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- College of Liberal Arts and Sciences (parent college)
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Abstract
We have investigated the structures of CF3I, and its dissociation products, adsorbed on Ru(001) using low-energy electron diffraction and electron-stimulated desorption ion angular distribution (ESDIAD). Atomic iodine forms (√3x√3)R30° islands even at very low coverages. At 70% of saturation and above, a (2X2) superstructure forms which we attribute to a p(2X2) unit cell with one CF3 group and one iodine atom. ESDIAD images show F+ desorbing at normal emission and in three hexagonal patterns. The normal emission is attributed to a tilted configuration of CF3(ad) in which one 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 CF3(ad) species possessing C3v symmetry. And finally, an intermediate hexagon is attributed to perturbation of the CF3(ad) orientation by molecular fragments which result from electron irradiation of physisorbed CF3I.
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Reprinted (adapted) with permission from Langmuir 12 (1996): 3472, doi: 10.1021/la950211v. Copyright 1996 American Chemical Society..