"tandem mass spectrometry": A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, gas chromatography-mass spectrometry is involved in separating relatively compounds by gas chromatography prior to injecting them into an ionization chamber for the mass selection.

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