Abstract
On rough surfaces of silver and some other metals the Raman signal of many adsorbates is enhanced by up to six orders of magnitude compared to expected signals of one free monolayer. Many different models have been proposed to explain this effect, among them the enhancement of the incident and scattered field by electromagnetic resonances (so-called ‘classical enhancement’) and by dynamical charge transfer between metal and adsorbate. I will concentrate on these two mechanisms—and present experimental evidence that the second mechanism is particularly strong at ‘active sites of atomic scale roughness’.
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