Mass-to-Charge Ratio

**Semantic type:** Phenomenon or Process

**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. (from IUPAC Compendium)

**Synonyms:** - m/z - mz