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In this window one can find the list of binding energies (in eV) for the isolated atoms of the given element
along with its atomic weight and density (under normal conditions).
On the right to the list a calculator is placed for mean free path and effective analysis depth (for the case of
primary electrons normal incidence and secondary electrons normal ejection).
The calculation of mean free path  (in angstroms)
is done with expression:
where a - is an average monolayer thickness in angstroms:
where
M - atomic weight;
Na - Avogadro's number;
 - density (gramm/cubic cm).
Energy E - is in electron-Volts.
Along with the electrons mean free path an effective analysis depth is also calculated under assumption that primary
electrons a normally incident on the sample and the detection of ejected electrons also happens near the surface's normal.
See also paragraph 7.4.
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