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- W1966012287 abstract "Using automated tensor LEED (ATLEED), the structure of I on Rh{111} has been studied in the coverage range from 0.12 to 0.33 monolayers, including the ordered (3 × 3)R30° phase. Jodine adatoms are bonded in fcc three-fold hollow “lattice” sites with an iodine-rhodium interplanar separation of 2.22 ± 0.06 Å and a first to second rhodium interlayer contraction of 3.7%. An iodine-to-rhodium nearest neighbour bond length of 2.71 Å indicates an iodine “effective radius” of 1.37 Å, very close to the covalent radius of 1.35 Å assuming a rhodium metallic radius of 1.34 Å. Adsorption in hcp hollow sites yielded a minimum Pendry R-factor of 0.40. The possibility of site mixing was examined and an R-factor minimum of 0.27 was obtained for 85 ± 15% fcc site occupation. The structure at lower coverages (0.25 and 0.12 ML), where only a diffuse p(1 × 1) LEED pattern is observed was examined by diffuse I–V analysis. Diffuse I–V spectra were found to be practically indistinguishable from spectra from the (3 × 3)R30° structure for identical parallel momentum transfer. An R-factor analysis indicates no coverage-dependent site switching and a coverage independent RhI bond length in the coverage range studied (0.12 ≤ θ ≤ 0.33 ML)." @default.
- W1966012287 created "2016-06-24" @default.
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- W1966012287 date "1993-01-01" @default.
- W1966012287 modified "2023-10-16" @default.
- W1966012287 title "A tensor LEED structural study of the coverage-dependent bonding of iodine adsorbed on Rh{111}" @default.
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- W1966012287 doi "https://doi.org/10.1016/0039-6028(93)90852-b" @default.
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