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|An ion that reacts to form particular product ions. The reaction could be unimolecular dissociation, an ion/molecule reaction, or involve simply isomerization (change in connectivity) or change in the number of charges. The older gender-specific term parent ion ion is not recommended.|
|Considered between 2004 and 2006 but not included in the 2006 PAC submission|
|This is an unofficial draft definition presented for information and comment.|
Orange Book Entry
Synonymous with Parent Ion. Instead of the use of parent ion and daughter ion terms the precursor and product ion terms are preferred respectively.