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- W2027786551 abstract "Abstract Adsorbate bonding to a nickel surface has been studied by use of a multiple-scattering Xα (MSXα) model for the adsorption of ethylene (C 2 H 4 ) on a Ni substrate. The Ni(100) surface was simulated by a 10-atom Ni cluster of C 4v point group symmetry, to which an adsorbed ethylene molecule was then added. The Ni 10 (100) cluster was found to be a reasonable model for the Ni(100) substrate; it shows a high density of states near the Fermi level, and a d-bandwidth of ~2.6 eV, as compared to ~3.5 eV for bulk Ni. In addition, the pristine cluster has a weak magnetization of ~0.2 magneton/atom; this is a significant reduction not only from the bulk Ni value (0.54 magneton/atom) but from the values found for small cubic Ni clusters of comparable size. The level structure of the isolated C 2 H 4 molecule was then calculated and compared with that of a Ni 10 (100) + C 2 H 4 π-bonded cluster, and the level shifts analyzed. It is indicated that the reported difference in activation energies for ethylene hydrogenation on paramagnetic and ferromagnetic Ni may be due to shifts in the Ni spd levels relative to the ethylene 1b 3u bonding orbital energy level, via the exchange splitting of ~0.1 eV." @default.
- W2027786551 created "2016-06-24" @default.
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- W2027786551 date "1984-01-01" @default.
- W2027786551 modified "2023-09-22" @default.
- W2027786551 title "Adsorption of ethylene on a nickel (100) substrate: A multiple-scattering Xα approach" @default.
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- W2027786551 doi "https://doi.org/10.1016/0039-6028(84)90667-8" @default.
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