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The plasmon-polariton bands excited optically in Ag-particle systems of various particle sizes were separated by applying both optical and photothermal spectroscopy. The dipolar absorption band, the dipolar scattering band, and the quadrupolar absorption band could be clearly resolved. The essential spectral features confirm the predictions of Mie's electromagnetic theory. Results are also shown for densely packed particle systems.
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Kreibig et al. (1987) studied this question.
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