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The Mass Spectrometer. In order to measure the characteristics of individual molecules, a mass spectrometer converts them to ions so that they can be moved about and manipulated by external electric and magnetic fields. The three essential functions of a mass spectrometer, and the associated components, are:
The mass measurement on the display is the mass of the sample only. The subtraction method involves measuring the mass of a sample by calculating the difference in the mass of a container with and without the added sample. The balance should be set to zero before the empty container is added to get accurate results with the subtraction method.