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Preferred Label : mass-to-charge ratio;

Detailed label : mass-to-charge ratio in mass spectrometry, mz;

IUPAC definition : 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 (C sub 7 /sub H sub 7 /sub sup 2 /sup ) , m/z equals 45.5.;

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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 (C sub 7 /sub H sub 7 /sub sup 2 /sup ) , m/z equals 45.5.

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30/07/2025


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