Areal density and spatial resolution of high energy electron radiography |
(color online) Schematic diagram of HEER. The trajectories of different colors starting at the object location represent electrons scattered into various angles within the object. The Fourier plane is located at the midpoint of the lens, where a collimator is positioned. The position–angle correlation at injection determines the location of the Fourier plane and partially cancels second-order chromatic aberrations. |