A Large Mass Spectrometer Employing Crossed Electric and Magnetic Fields

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Abstract
Because of continued general interest in this type of instrument and because of relationship with previously published work it has seemed desirable to report here the progress made, up to cessation of work in 1940, on a large crossed field mass spectrometer, the basic design features of which were directed toward a resolution of about 25,000 in order to permit its use for mass measurement. Although the instrument was necessarily diverted to less exacting applications before development was sufficiently complete to permit attainment of this high resolution, nothing in experience with the instrument indicated that the goal could not substantially have been reached.