An electromagnetic theory for the light absorption by a cluster of metal spheres and the Raman scattering by a molecule adsorbed on it is presented, which takes into account the retardation effect exactly and is applicable to an arbitrary cluster size. The theory is applied to a two-sphere cluster of Ag and Au. It is shown that the absorption spectrum is doubly peaked and the maximum enhancement factor of the Raman intensity amounts to 10 7 ∼10 8 when the distance between spheres is decreased. Absorption spectra of three- and four-sphere clusters are also calculated, which indicate that the essential features of the experimental observations are explained by the two-sphere cluster.
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Inoue et al. (1983) studied this question.
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