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Material Dependence of Electron Inelastic Mean Free Paths at Low Energies

Published

Author(s)

Shigeo Tanuma, Cedric J. Powell, David R. Penn

Abstract

We have calculated electron inelastic mean free paths (IMFPs) for 50-2000 eV electrons in 31 materials (27 elements and 4 compounds). We present and discuss in this paper IMFP data for aluminum and gold in the 50-2000 ev Range. Substantial differences are found in the shapes of the IMFP versus energy curves and these can be understood in terms of the different inelastic scattering mechanisms in the two metals. The minimum IMFP value occurs at 40 eV in aluminum and at 120 eV in gold, a result which is consistent with the trends expected from free-electron IMFP calculations. This result differs, however, from that expected from the Seah and Dench attenuation length formula which shows essentially no material dependence at low energies. We have extended a general formula derived earlier to describe the calculated IMFPs over the 200-2000 eV energy range to give the IMFP dependences on material and energy from 50 to 2000 eV.
Citation
Journal of Vacuum Science and Technology A
Volume
8
Issue
3

Citation

Tanuma, S. , Powell, C. and Penn, D. (1990), Material Dependence of Electron Inelastic Mean Free Paths at Low Energies, Journal of Vacuum Science and Technology A (Accessed March 2, 2024)
Created December 31, 1989, Updated October 12, 2021