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Full-Text Articles in Physical Sciences and Mathematics
Nickelocene Adsorption On Single-Crystal Surfaces, D. L. Pugmire, C. M. Woodbridge, S. Root, Marjorie Langell
Nickelocene Adsorption On Single-Crystal Surfaces, D. L. Pugmire, C. M. Woodbridge, S. Root, Marjorie Langell
Marjorie A. Langell Publications
Nickelocene adsorption onto Ag(100), Ni(100), and NiO(100)/Ni(100) surfaces was studied with x-ray photoelectron spectroscopy and high-resolution electron energy loss spectroscopy at 135 K for monolayer and multilayer coverages of NiCp2. On the relatively inert Ag(100) surface, nickelocene physisorbs molecularly, with its molecular axis perpendicular to the surface plane. Exposure to the reactive Ni(100) surface results in the decomposition of nickelocene into acetylene and acetylene-like fragments and, when this surface is warmed to 273 K, carbide contamination is observed. There is evidence for double-bond carbon on nickelocene-exposed NiO(100), and vinyl and propenyl fragments are the most likely decomposition products …
Surface Composition Of CoXNi1-XO Solid Solutions By X-Ray Photoelectron And Auger Spectroscopies, M. W. Nydegger, G. Couderc, Marjorie Langell
Surface Composition Of CoXNi1-XO Solid Solutions By X-Ray Photoelectron And Auger Spectroscopies, M. W. Nydegger, G. Couderc, Marjorie Langell
Marjorie A. Langell Publications
The surface and bulk compositions of the mixed metal oxide CoxNi1-xO have been compared over the entire range of stoichiometry 0 ≤ x ≤ 1. The materials, which were formed as polycrystalline solid solutions, were shown to be well-ordered and homogeneous in the bulk, but tend to deviate in their surface composition for x > 0.6. Auger and X-ray photoelectron spectroscopy gave comparable results and indicated that the surface composition for samples showing deviation from bulk stoichiometry was compatible with the formation of a spinel-like NiCo2O4 surface phase. XPS binding energies and spectral …
Valence-Band Electronic Structure Of Co3O4 Epitaxy On Coo(100), Marjorie Langell, M.D. Anderson, G.A. Carson, L. Peng, S. Smith
Valence-Band Electronic Structure Of Co3O4 Epitaxy On Coo(100), Marjorie Langell, M.D. Anderson, G.A. Carson, L. Peng, S. Smith
Marjorie A. Langell Publications
Valence-band photoemission studies have been performed on a CoO(100) single crystal as it is slowly oxidized under 1×10-4 Torr O2 at 623 K, eventually forming a Co3O4 epitaxial film. The most significant changes occur in 3d-related features, with the peak located at the top of the valence band sharpening and shifting to lower binding energies as the spinel oxide forms. Constant initial-state measurements indicate that Co3O4 contains admixture from neighboring O 2p in its 3d band, as observed for CoO and other monoxide charge-transfer insulators. Unlike the rocksalt …