|The symbol m/z is used to denote the dimensionless quantity formed by dividing the mass of an ion in atomic units by its charge number. The symbol is italicized lower case letters with no spaces.|
|Considered between 2004 and 2006 but not included in the 2006 PAC submission|
|This is an unofficial draft definition presented for information and comment.|
See additional comments on the M/z discussion page (archive of discussion between 2004 and 2006)
Orange Book Entry
Gold Book Entry
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.