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See additional comments on the M/z discussion page (archive of discussion between 2004 and 2006)

Orange Book Entry

Orange Book


IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979.


m/z ratio.

IUPAC 1997 Orange Book Chapter 12
Index of Orange Book Terms

Gold Book Entry

Gold Book


IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).


The abbreviation m/z is used to denote the dimensionless quantity formed by dividing the mass number of an ion by its charge number. It has long been called the mass-to-charge ratio although m is not the ionic mass nor is z a multiple or the elementary (electronic) charge, e. The abbreviation m/e is, therefore, not recommended. Thus, for example, for the ion C7H72+, m/z equals 45.5.

IUPAC Gold Book
Index of Gold Book Terms

See also

External links