Abstract
A 90° sector type mass spectrometer tube made of Monel is described. The design is such that the electrode assemblies and analyzer section are easily removable without destroying the slit alignment. A double gasket arrangement is used for making the necessary high vacuum seals. The tube can be operated at an elevated temperature with no cold spots which is particularly desirable for degassing and for studying samples which have low vapor pressures. Operation of the analyzer section at any desired potential with respect to ground is permitted.

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