A modified Aston-type mass spectrometer is described, in which ionization is produced by controlled electron bombardment. The electric field used is radial, and the shape of the magnetic pole faces was calculated to give the necessary velocity focusing. A special type of filament assembly is employed to minimize the energy spread of the emitted electrons. An amplifier circuit is described using a Western Electric D-96475 tube which gives high sensitivity combined with good stability. A new device is described for giving a continuous indication proportional to the square of the magnetic field. Some preliminary results are included on the ionization of N₂, CO, NH₃, N₂{H}₄$.
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Dean Dalton Taylor (1935) studied this question.
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