Practical Electron Microscopy and Database

Table 4623 lists plasmon energies, full-width-at-half-maximum of plasmon energies, plasmon mean free path, and inelastic mean free path of some common elements and compounds, as well as their crystal structure.

Measurements of numbers of inelastic and elastic mean free paths [1]:
         i) t/λ_i, from EELS spectra, should be recorded with the objective aperture withdrawn. λ_i is the inelastic mean.
free path.
         ii) t/λ_e can be obtained simply by recording the low-loss spectrum of the specimen with a small objective aperture. λ_e is the elastic mean free path.

[1] K. Wong and R. F. Egerton, Correction for the effects of elastic scattering in core-loss quantification, Journal of Microscopy, 178(3), (1995) pp. 198-207.