A mass spectrometer, designed for investigating different source arrangements with great ease, has been completed. It is an all metal, sector-shaped magnetic field type, constructed so that it may be disassembled, repaired, or modified without altering its focusing properties in any way. An important feature of the design is a removable ion source unit. A new source arrangement, investigated with this instrument, is discussed.
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Coggeshall et al. (1943) studied this question.
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