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Gas analysis by mass spectrometry, or gas mass spectrometry, is a useful analytical tool for investigations performed in controlled atmospheres or in vacuum. This article provides sufficient information to determine if gas mass spectrometry can produce the data required and to determine the type of instrument necessary for a particular application. It discusses the working operations of gas mass spectrometer components, namely, the introduction system, ion sources, mass analyzers, and the ion detector. The article also provides information on resolution of a gas mass spectrometer determined by the width of the source slit and the collector slit. Finally, it...

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