A Wide Angle Magnetic Spectrometer

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Abstract
It is pointed out that in certain problems advantages in current intensity would be gained by having a magnetic spectrometer which would focus widely divergent ions. The usual semicircular type of spectrometer brings divergent rays to a first order focus. By making the proper variation in the intensity of the deflecting magnetic field one can obtain a second order focus. An integral equation is developed to determine the required variation of the magnetic field and a simple method of obtaining the field is given. An instrument now in use for the study of aged ions in gases is briefly described.

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