Both plasmon excitations and interband transitions are important in the response of valence bands to fast electrons. An extended Drude dielectric function was established to describe such a response in solids of complex band structures. Parameters in this function were determined by a fit of the imaginary part of the function to experimental optical data. The real part of the dielectric function and the energy-loss function were also checked with experimental data to confirm critical-point energies in the interband transitions and plasmon energies in the collective excitations. In addition, sum-rules about the imaginary part of the dielectric function and the energy-loss function, respectively, were applied to assure the accuracy of these functions. Electron inelastic mean free paths in several solids were calculated and compared to available experimental and theoretical data. © 1993.
CITATION STYLE
Kwei, C. M., Chen, Y. F., Tung, C. J., & Wang, J. P. (1993). Electron inelastic mean free paths for plasmon excitations and interband transitions. Surface Science, 293(3), 202–210. https://doi.org/10.1016/0039-6028(93)90314-A
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