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Calculate the minimum probe size of an electron beam with an energy of 20 keV, probe current of 3 mA, the brightness of 3.04 X 109 A . cm^-2 sr^-1 and a spherical aberration of 2 mm (take K = 1.3 and λ = 0.008 nm).

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Calculate the minimum probe size of an electron beam with an energy of 20 keV, probe current of 3 mA, the brightness of 3.04 X 109 A . cm-2 sr-1 and a spherical aberration of 2 mm (take K = 1.3 and λ = 0.008 nm).