Abstract

With the use of a simple model for the complex frequency-dependent dielectric constant (ω), the electron energy-loss function −Im[1/(ω)] was calculated with the model parameters being varied systematically in a physically reasonable range. The intensity as well as the position of structure in −Im[1/(ω)] are strongly influenced by the admixture of free-electron- and interband-transition contributions to (ω). Where such admixture effects occur in real materials, it is not meaningful to attribute structure in −Im[1/(ω)] exclusively to plasmon excitation or to interband transitions.

© 1969 Optical Society of America

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