Figure 3
Pre-Fraunhofer patterns for defocusing of Δf = 22 mm and their intensity profiles: (a) electrons that passed through only the left slit, (b) electrons that passed through the double slit, and (c) electrons that passed through only the right slit. Patterns in the top row (a-1), (b-1), and (c-1) are for the pre-Fraunhofer patterns at a low electron dose of 0.02 electrons/pixel on average. Patterns in the middle row (a-2), (b-2), and (c-2) are for a relatively high electron dose of 20 electrons/pixel on average. Patterns in the bottom low (a-3), (b-3), and (c-3) are averaged intensity profiles. Contrasts of the Fraunhofer patterns are reversed for a better view.
