Aberration-correcting dark-field electron microscopy

摘要

A transmission electron microscope includes an electron beam source to generate an electron beam. Beam optics are provided to converge the electron beam. An aberration corrector comprising either a foil or a set of concentric elements corrects the electron beam for at least a spherical aberration. A specimen holder is provided to hold a specimen in the path of the electron beam. A detector is used to detect the electron beam transmitted through the specimen. The transmission electron microscope may be configured to operate in a dark-field mode in which a zero beam of the electron beam is not detected. The microscope may also be capable of operating in an incoherent illumination mode.