Because of their simple, robust design, sector field mass spectrometers are used for helium leak detectors. Their mass range is restricted to masses of between 2 u (hydrogen molecule) and 4 u (helium atom). This makes it possible to build small, compact but very powerful mass spectrometers.
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Introduction to Vacuum Technology
Mechanical components in vacuum
Vacuum measuring equipment
Mass spectrometers and residual gas analysis
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