Abstract
Abstract It is shown that the electron energy loss distributions observed in electron transmission (energy 23–70 kev) through Al films 435 A–1950 A thick may be fitted in the energy ranges from 5 to 55–100 ev within a deviation of a few per cent. The fitting is made in terms of assumed electron energy loss distributions for the principal volume and surface losses which are centred, respectively, at about 15 ev and 7 ev. Consistent values of λi, the mean free path for single (volume) inelastic electron scattering into all angles, are evaluated for six electron energies in the given range. An attempt has been made to evaluate in detail the effects on the observed energy loss spectra of the energy loss distributions arising from surface and surface-volume electron interactions. The determined values of λi are in good agreement with the plasma oscillation theory.
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