Article,

Quantitative electron spectroscopy of surfaces: A standard data base for electron inelastic mean free paths in solids

, and .
Surf. Interface Anal., 1 (1): 2--11 (1979)
DOI: 10.1002/sia.740010103

Abstract

A compilation is presented of all published measurements of electron inelastic mean free path lengths in solids for energies in the range 0-10 000 eV above the Fermi level. For analysis, the materials are grouped under one of the headings: element, inorganic compound, organic compound and adsorbed gas, with the path lengths each time expressed in nanometers, monolayers and milligrams per square metre. The path lengths are vary high at low energies, fall to 0.1-0.8 nm for energies in the range 30-100 eV and then rise again as the energy increases further. For elements and inorganic compounds the scatter about a üniversal curve" is least when the path lengths are expressed in monolayers, lambdam. Analysis of the inter-element and inter-compound effects shows that lambdam is related to atom size and the most accuratae relations are lambdam = 538E-2+0.41(aE)1/2 for elements and lambdam=2170E-2+0.72(aE)1/2 for inorganic compounds, where a is the monolayer thickness (nm) and E is the electron energy above the Fermi level in eV. For organic compounds lambdad=49E-2+0.11E1/2 mgm-2. Published general theoretical predictions for lambda, valid above 150 eV, do not show as good correlations with the experimental data as the above relations.

Tags

Users

  • @nplumb

Comments and Reviews