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The magnitude of the total magnetic field in the vicinity of a single round coil pair, a single square coil pair, and a trio of mutually orthogonal round coil pairs has been computer calculated, and the results graphically displayed as a series of contour lines. An investigation of the uniformity of field as a function of coil spacing indicates a distinct optimum near the Helmholtz spacing.

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Absolute differential cross sections for the production of electrons by collisions of neon ions with a neon-gas target and argon ions with an argon-gas target were measured. The cross sections were doubly differential in angle and energy of the ejected electrons. The energy range of the primary ions was 50 to 300 keV. Electrons that were produced by the ion-atom collisions were analyzed in angle and energy, counted, and, from a knowledge of the other parameters of the apparatus, an absolute cross section was determined. The experimental results show some structure in the electron-energy spectra superimposed on a continuous background. This is consistent with the predictions of the Fano-Lichten electron-promotion model. Calculations based on the results of the Russek statistical model are compared with experiment.