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Based on Theory on Inelastic Mean Free Path (IMFP) of Electrons, the electron
mean free paths are well known in two energy regimes: at high energies, where they
are predicted either with Bethe(like) equations or with the more accurate optical models
based on the freeelectrongas approximation, and at very low energies, where they
are calculated either with experimental data on electron lifetimes or with firstprinciples calculations.
Figure 4809a. Electron mean free path of some elements at different kinetic energies.
Figure 4809b. Mean free paths at different kinetic energies up to 2000 eV, for Ag, Al, NA, PMMA, Si, and SiO_{2}.
Figure 4809c. Mean free paths at the kinetic energy range below 250 eV, for Ag, Al, GaAs, NA, PMMA, and Si.
Figure 4809d. Mean free paths at high kinetic energies for Si and SiO_{2}.
Table 4623 lists plasmon energies, fullwidthathalfmaximum of plasmon energies, plasmon mean free path, and inelastic mean free path of some common elements and compounds, as well as their crystal structure [6  11].
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