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aberration coefficients amplitude angle aperture approximation astigmatism atoms axial Boersch calculated cathode cathode-ray tube characteristic function chromatic aberration coherent coil constant contrast correction corresponding curve deflection density diameter diffraction distance distribution effect electron beam electron gun electron lenses electron optics electrostatic Elektronen emission energy equation expression figure filament first-order focal length focusing formula Fourier transform fringes function Gaussian given Hanszen hologram illumination image plane integral lentille limit Linse Linsen magnetic field magnetic lens magnification maximum method micrograph object plane objective lens obtained optic axis Optik parameters paraxial particles perturbation phase shift Phys Physics pole pieces position possible potential principal curve radius reconstruction resolution resolving power rotation scanning electron microscope scanning microscope scattering Scherzer screen shown in Fig solution specimen spherical aberration structure superconducting surface symmetry third-order tion trajectory tube variation vector voltage wave zero