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The radiative decay of non-radiative surface plasmons excited by fast electrons on sinusoidally modulated Ag surfaces has been investigated systematically for different modulation heights. The position and half-width of the surface-plasmon dispersion of weakly modulated gratings are in agreement with theoretical values derived for smooth surfaces; for stronger modulated gratings, displacement and broadening of the surface-plasmon dispersion and multiple-scattering are found.
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D. Heitmann (1977) studied this question.
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