Genesis of potential structures for electron spectrography

A procedure for designing potential structures to divide the charged particle flow spatially into several monoenergetic beams has been proposed in the article. The analytic potential structures are selected out of a class of generalized uniform electrostatic fields where a special mechanical principle of similarity is obeyed approximately in some region. The equipotential-surface plane pictures of these fields are demonstrated, and the near-term prospects of electron spectrography are discussed.