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LOW ENERGY ELECTRON INDUCED PLASMON EXCITATIONS IN THE ORDERING Pt₈₀Co₂₀(111) ALLOY SURFACE

M. A. VASYLYEV

Institute for Metal Physics, Nat. Acad. Sci., Ukraine

Akad. Vernadsky Blvd. 36, 03680 Kiev-142, Ukraine

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and

V. A. TINKOV

Institute for Metal Physics, Nat. Acad. Sci., Ukraine

Akad. Vernadsky Blvd. 36, 03680 Kiev-142, Ukraine

Corresponding author.

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https://doi.org/10.1142/S0218625X08011809Cited by:8 (Source: Crossref)

Abstract

Surface and bulk plasmon excitations from the ordering Pt₈₀Co₂₀(111) alloy surface are studied by means electron energy loss spectroscopy in the low energy range of the primary electron energy E₀. Deviation of the plasmon excitations from the theoretical value was found for Pt, Co metals, and Pt₈₀Co₂₀(111) alloy as calculated in the free-electron gas model. For the ordered alloy, the bulk plasmon energy is 2–3 eV more than for the disordered alloy, whereas the difference for surface plasmon energy is 4–7 eV in the range E₀ = 150–800 eV. The ration of intensity lines of plasmons η from E₀ was investigated for the (dis)ordered state of the Pt₈₀Co₂₀(111) alloy surface. For the ordered alloy, η has prolonged dependence from energy E₀ in comparison with the disordered alloy. The relationship between layer-by-layer surface concentration and surface plasmon damping was observed.

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