https://doi.org/10.1351/goldbook.09760
Peptide ion generated during the ionisation of peptides in an ion source or during tandem mass spectrometry of an intact protein in top-down proteomic analysis, selected for further analysis by means of tandem mass spectrometry.
Note: Once generated, a peptide fragment ion may become a precursor ion for tandem mass spectrometry of higher orders (\({\rm{MS}}^{n}\), \(n = 3\)).