A triple quadrupole mass spectrometer (often abbreviated as 'QQQ' or 'QqQ') is a tandem mass spectrometer consisting of two quadrupole mass analyzers in series, with a collision cell (also a quadrupole) in between. It is used in analytical chemistry for a wide range of applications including quantification, identification, and structural analysis. It excels in selected reaction monitoring (SRM) and multiple reaction monitoring (MRM) experiments, making it a powerful tool for targeted analysis of specific compounds in complex mixtures.
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