We present a force constant slab calculation of the nickel (001) surface phonons with p(2×2) and c(2×2) oxygen overlayers. According to very recent experimental results we assume in both configurations an equal distance of 0.9 Å between the oxygen overlayer and the nickel surface. With two adjustable parameters (the 0-Ni force constants) we are able to reproduce with good accuracy the position and the lineshape of the four peaks present in the experimental EELS spectra. The nature of these peaks is investigated in detail and the noticeable difference between the spectra of the two overlayers is explained. © 1983 Elsevier Scientific Publishing Company.
Calculation of the eels spectra of the Ni(001) surface with p(2×2) and c(2×2) overlayers of oxygen / Bortolani, V.; Franchini, A.; Nizzoli, F.; Santoro, G.. - 14:C(1983), pp. 219-224. (Intervento presentato al convegno Vibrations at Surfaces. Proceedings of the Third International Conference tenutosi a Asilomar, California, U.S.A. nel 1-4 September 1982) [10.1016/S0167-2991(09)61054-5].
Calculation of the eels spectra of the Ni(001) surface with p(2×2) and c(2×2) overlayers of oxygen
Bortolani V.;Franchini A.;
1983
Abstract
We present a force constant slab calculation of the nickel (001) surface phonons with p(2×2) and c(2×2) oxygen overlayers. According to very recent experimental results we assume in both configurations an equal distance of 0.9 Å between the oxygen overlayer and the nickel surface. With two adjustable parameters (the 0-Ni force constants) we are able to reproduce with good accuracy the position and the lineshape of the four peaks present in the experimental EELS spectra. The nature of these peaks is investigated in detail and the noticeable difference between the spectra of the two overlayers is explained. © 1983 Elsevier Scientific Publishing Company.
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