The application of energy analyzers in electron microscopy, the raster one in particular, is an interesting and comparatively new trendI-3. The analyzers can be used, for instance, for separating the elastically and inelastically scattered electrons, which leads to substantial improvement of the image contrast, and, accordingly, the space resolution. Monoenergetic images of a specimen obtained with energy analyzers permit of judging the topography of the specimen surface in connection with various physical properties of the specimen.At present, cylindrical mirrors are usually used as the analyzers for the above purpose. They are applicable, however, only for wide angle beams (the optimal angles lie within the range of 40°-50°).We propose an energy analyzer designed to operate both at narrow and wide angles of beam.The analyzer consists of two coaxial electrodes in the shape of surfaces of revolution, i.e. hyperboloids, paraboloids, cones (Fig.). Ringed windows (I,2) are cut in the electrodes for passage of a beam which has the form of a hollow cone.
