M/z: Difference between revisions
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|acronym= | |||
|def=Deprecated: [[mass-to-charge ratio]], [[Thomson]]. | |||
Abbreviation representing the dimensionless quantity formed by dividing the ratio of the mass of | |||
an ion to the [[unified atomic mass unit]], by its charge number (regardless of sign). The abbreviation is written in italicized lowercase letters with no spaces. | |||
:Note 1: [[Mass-to-charge ratio]] is deprecated. Mass-to-charge ratio has been used occasionally for the horizontal axis in a plot of a mass spectrum, although the quantity measured is not the ions mass divided by its electric charge (SI units kg C1). However, m/z is recommended as an abbreviation to represent the dimensionless quantity that is used almost universally as the independent variable in a mass spectrum. | |||
:Note 2: The abbreviation m/z should not be used as a variable in a mathematical equation. Instead, the variables m (in kg) and q (in C) should be used to denote mass and charge. | |||
:Note 3: The equal sign should not be used to denote a m/z value, for example, use m/z 100 and not m/z = 100. | |||
:Note 4: The [[thomson]] (Th) unit is deprecated. | |||
|rel= | |||
|ref={{obgb}} | |||
}} | }} | ||
==Orange Book== | |||
<!-- Orange Book --> | <!-- Orange Book --> | ||
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''m/z'' ratio. | ''m/z'' ratio. | ||
}} | }} | ||
==Gold Book== | |||
<!-- Gold Book --> | <!-- Gold Book --> | ||
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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. | 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. | ||
}} | }} | ||
[[Category:Mass]] | [[Category:Mass]] | ||
[[Category:Units]] | [[Category:Units]] | ||
{{DEFAULTSORT:M/Z}} | {{DEFAULTSORT:M/Z}} |