Abstract
We consider the uncertainties attendant on the abstraction of mean excitation energies from experimental stopping power data. We conclude that the imprecision in the higher order Born expansion terms (e.g. Barkas and Bloch corrections) and, the deviation from asymptotic First Born approximation behavior (the shell corrections) make it impossible to determine experimental mean excitation energies with precision better than ∼ 5 eV for Al.
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