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The plasmon oscillations in a cluster of two nearly touching metallic nanospheres are studied. Simple analytical expressions have been found for the spectra of plasmon oscillations of different symmetry. A type of plasmon oscillations (``plasmonic molecule'') which are strongly localized between the spheres and which totally disappear at separation of the spheres has been discovered. The plasmon oscillations found have a dramatic effect on the optical properties of an atom localized between the spheres.
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Климов et al. (2007) studied this question.
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