A new, all-electric mass-filter is discussed. The time-dependent acceleration of the ions in a high-frequency field is measured and used to screen the mass. The spatial distribution of the electric field is characterized by its potential Vx, y, z, t, which must be a pure quadratic function of the coordinates x, y, z.
Trans. of Zeitschrift fuer Physik (West Germany) v140 p262-273 1955, by G. Duffy.