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In EMs, the resolution limit due to chromatic aberration can be estimated by,

                    --------------------------------- [4241]

where,
           C_c -- Chromatic aberration coefficients
           λ --  Electron wavelength
           ΔE/E -- Relative energy width of the electron beam

We can see that Equation 4241 is related to a beam broadening factor due to chromatic aberration (C_c) of the objective lens because of the finite width of the energy-selecting slit.

Example of estimated resolution limits are shown in Figure 4241. At high accelerating voltages (e.g. 200 kV) the spherical aberration is dominant, while at low accelerating voltages (e.g. 1 kV) the chromatic aberration is dominant. Generally speaking, spherical aberration is the dominant resolution-limiting aberration at accelerating voltages larger than about 100 kV.