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• W2034690600 abstract "The Ag(110) surface was studied at various stages of annealing and ion bombardment cycles by means of reflection-anisotropy spectroscopy (RAS) and scanning tunneling microscopy (STM). At low fluence and a limited number of heat treatment cycles, a positive RAS signal at 3.8 eV, followed by a negative peak at 3.9 eV, was recorded. STM showed that the room-temperature surface corresponding to this curve profile had steps whose edges were parallel with the in-plane [110] direction. At longer sputtering times, with several cycles of annealing, we obtained a statistically isotropic distribution of steps and terraces. Ag(110) surfaces of the latter kind result in RAS curves where the positive low-energy component at 3.8 eV is absent. We discuss the spectra in terms of local-field calculations where the screened dipole–dipole interaction coefficients are modified by surface steps. If the step edges are isotropically distributed instead of parallel with the [110] direction, the strength of the low-energy part of the RAS curve is reduced. However, the calculated reduction in strength is not enough to account for the experimental results. Step-induced coupling to surface plasmons is an additional mechanism, which gives a much stronger reduction in strength. The influence of both effects on the RAS curve increases with decreasing correlation length. The plasmon-based mechanism takes place already at lengths of the order of 102 nm, whereas the cut-off in the dipole–dipole interaction needs correlation lengths that are almost one magnitude lower to be important." @default.
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• W2034690600 date "2000-07-01" @default.
• W2034690600 modified "2023-10-16" @default.
• W2034690600 title "The influence of surface steps on the optical and electronic anisotropy of Ag(110)" @default.
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• W2034690600 doi "https://doi.org/10.1016/s0039-6028(00)00440-4" @default.
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