Bright sources under the projection microscope: using an insulating crystal on a conductor as electron source | The European Physical Journal Applied Physics (EPJ AP)

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Fig. 1

The size of the ion source is determined by measuring the contrast at the edge of the shadow of an object. Magnification: G = 180000, ion source potential V = 2 kV, source-screen distance D = 40 cm, source-object distance d = 2.2 μm

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