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The condenser lens system and its apertures
Dark field electron microscopy
1 other sections not shown
achieved Airy disc angular aperture astigmatism attachment back scattered electrons beam current camera chromatic aberration commercial scanning electron condenser lens system crystal crystalline dark field detector device diameter diffraction pattern disc display tube electromagnetic condenser electromagnetic lenses electron beam electron diffraction electron gun electron image electron micro electron micrographs electron optical electron spot electrons passing examined figure filament film final image final lens fluorescent screen focus illuminating electron beam image formation incident electrons intensity of brightness intermediate lens lens aperture lens axis lens polepiece magnetic field manufacturers microscope column mode of image modulate the intensity mounted normal objective lens operated optical microscope potential primary electron projector lens reflection electron microscopy resolving power scanning electron microscope scope secondary electron secondary electron emission selected area diffraction signal specimen chamber specimen holder specimen surface spherical aberration surface topography transmission electron microscope usually vapour viewing chamber wavelength Wehnelt cylinder X-ray