mass-to-charge ratio, mz

in mass spectrometry
https://doi.org/10.1351/goldbook.M03752
The abbreviation mz 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 me is, therefore, not recommended. Thus, for example, for the ion (C7H72+) , mz equals 45.5.
Source:
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1544 [Terms] [Paper]
Citation: 'mass-to-charge ratio' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.M03752 RIS BibTex EndNote
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