EELS Edge Onset
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The EELS edge onset is the sudden rise in intensity preceding peaks, representing the ionization threshold which approximately corresponds to the inner-shell binding energy.

Inner shell excitations occur at energies:
         ΔE ≥ EF - EB ----------------------------------- (3437)
         ΔE -- The energy loss
         EF -- The Fermi level energy
         EB -- Binding energy of the inner shell
The EELS feature corresponds to "core loss edges" or "edge onset" (ΔE = EF - EB).