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- W2075705654 abstract "The adsorption of H2O on both clean and modified Ni(110) surfaces has been studied using a variety of methods: electron stimulated desorption ion angular distribution (ESDIAD), thermal desorption spectroscopy (TDS), and low energy electron diffraction (LEED). Fractional monolayers, θ(H2O) < 0.5, of H2O on clean Ni(110) are associated with a four-spot ESDIAD pattern suggesting that the H-ligands are in specific registry with the substrate. We postulate the formation of H2O dimers bound via oxygen lone pair orbitals to Ni substrate atoms and oriented with the O … HO axis in [001] azimuthal directions. For θ(H2O) > 0.5–1 larger hydrogen bonded clusters with long range c(2 × 2) symmetry are formed. Upon heating to ⩾ 200 K, a fraction of the H2O dissociates, forming OH(ad). TDS of H2O from clean Ni(110) reveals four binding states having peak temperatures of 155, 210, 245 and 370 K. They are related to multilayer desorption (155 K), desorption from larger bilayer clusters (210 K), desorption from H2O dimer clusters which might be stabilized by OH (245 K), and recombination of OH to yield H2O(g) (360 K). Dissociation of H2O is promoted by surface oxygen. For the adsorption of H2O on oxygen-dosed Ni(110) at θ(O) > 0.08, a mixture of molecular and dissociative adsortion occurs immediately at 80 K, producing inclined OH. Isotropic exchange of H216O with 18O(ad) is observed even for binding states in which dissociation is believed not to to occur and is related to a proton exchange involving H2O(ad) hydrogen bonded to O(ad)." @default.
- W2075705654 created "2016-06-24" @default.
- W2075705654 creator A5014276451 @default.
- W2075705654 creator A5087027585 @default.
- W2075705654 date "1988-01-01" @default.
- W2075705654 modified "2023-09-24" @default.
- W2075705654 title "Adsorption of H2O on clean and oxygen-preposed Ni(110)" @default.
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- W2075705654 doi "https://doi.org/10.1016/0039-6028(94)91245-9" @default.
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