Abstract
Several systems of isolated silver particles have been produced by different methods and have been analysed by electron microscopy. Their optical absorption spectra in the region of the spherical plasma resonance were recorded and compared with calculated spectra. The experimental plasmon band width was found to differ markedly from the predictions of size effect theories in several particle systems, while in other systems correspondence was observed. These discrepancies are attributed to different concentrations of lattice defects in the particles. Electron-lattice defect relaxation frequencies determined from the optical spectra differ by more than one order of magnitude in differently prepared particles. It is further shown that extended defects such as grain boundaries in regular particles may cause size dependencies of the dielectric constant of the particle material, in addition to those induced by the particle surface.
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