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• W2057672736 abstract "The adsorption of methyl halides (Cl, Br and I) on a Ag(111) surface has been investigated by temperature programmed desorption (TPD), work function change (ΔΦ), ultraviolet photoelectron spectroscopy (UPS), and X-ray photoelectron spectroscopy (XPS). All three compounds adsorb with high sticking probability at 100 K, even up to multilayer coverages. The absolute coverage at one monolayer of CH3X is independent of X and is (4.6 ± 0.3) × 1014 molecules/cm2. UPS and XPS spectra suggest that the adsorption of methyl halides is molecular at 100 K and with little distortion of the corresponding gas-phase molecular electronic structures. Submonolayer adsorption is accompanied by a significant work function decrease (ΔΦ between −0.83 and −1.25 eV) indicating a dipole with the positive end pointed away from the surface. At high exposures, multilayers form and desorb at 113 (Cl), 121 (Br), and 136 K (I). Whereas chemisorbed monolayer coverages of CH3C1 and CH3Br desorb, with Tp = 126 and 142 K, without detectable decomposition, a significant fraction (≅ 35%) of monolayer CH3I dissociates between 130 and 190 K to give adsorbed CH3 and I. The dissociation of CH3I is accompanied by a decrease in the binding energy of the I(3d52) core electrons. The adsorbed CH3 does not dehydrogenate on Ag(111), but recombines above 190 K to yield C2H6 which immediately desorbs." @default.
• W2057672736 created "2016-06-24" @default.
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• W2057672736 date "1989-09-01" @default.
• W2057672736 modified "2023-09-25" @default.
• W2057672736 title "Interactions of methyl halides (Cl, Br and I) with Ag(111)" @default.
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• W2057672736 doi "https://doi.org/10.1016/0039-6028(89)90214-8" @default.
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