Maintained by
Alicia Gregory

Updated 2-01-07

Mass spectrometry involves the measurement of the mass-to-charge ratio of ions. Fundamental components of mass spectrometers include a means of sample introduction, a method of generating gas-phase ions, a mass analyzer (with a vacuum system), and an ion detector. Modern mass spectrometers have a data system for instrument control and data output.

A mass spectrum is the graph of ion intensity (or relative abundance) vs. mass (or, more properly, m/z - the mass-to-charge ratio).

A useful overview of mass spectrometry may be found at the website of the American Society for Mass Spectrometry: www.asms.org/whatisms