Abstract
Using the simple model of electrons in a box, a dielectric function is derived which should be appropriate for small metal particles. This dielectric function is used to examine quantum size effects in the optical absorption spectra. For very small particles of uniform size and shape, the plasma resonance absorption should shift and broaden and should show fine structure corresponding to transitions between discrete conduction band energy levels. The size dependence of the shift and broadening was measured and found to be in quantitative agreement with theory.
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Genzel, L., Martin, T.P. & Kreibig, U. Dielectric function and plasma resonances of small metal particles. Z Physik B 21, 339–346 (1975). https://doi.org/10.1007/BF01325393
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DOI: https://doi.org/10.1007/BF01325393