has material output material input of role of has role ion material input role mass spectrometry role product ion role precursor ion role precursor role progenitor ion K. K. Murray, R. K. Boyd, M. N. Eberlin, G. J. Langley, L. Li and Y. Naito, Pure Appl. Chem., 2013, 85, 1515-1609 progenitor ion role Precursor ion role is a role in mass spectrometry inhered in an ion that reacts to form particular product ions or undergoes specified neutral losses. The reaction can be of different types including unimolecular dissociation, ion/molecule reaction, change in charge state, possibly preceded by isomerization. [IUPAC] precursor precursor ion precursor ion role progenitor ion role process