Retrieving "Precursor Ion" from the archives

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1. Mass Spectrometry

   Linked via "precursor ion"

   Tandem mass spectrometry involves performing sequential stages of mass analysis. A common configuration is $\text{MS/MS}$ (sometimes denoted as $\text{MS}^2$), which involves three steps:
   Selection: A specific precursor ion ($m/q$ selection) is isolated in the first mass analyzer.
   Fragmentation: The isolated ion is subjected to an activation energy source, typically collision-induced dissociation (CID), where the ion collides with an inert gas (like [ar…