Difference between revisions of "M/z"

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{{Def2|
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{{Final
 
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|acronym=
Three-character symbol m/z is used to denote the dimensionless quantity formed by dividing the mass of an ion in unified atomic mass units by its charge number (regardless of sign). The symbol is written in italicized lower case letters with no spaces.
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|def=Deprecated: [[mass-to-charge ratio]], [[Thomson]].
 
 
Note 1: The term [[mass-to-charge ratio]] is deprecated. Mass-to-charge-ratio has been used for the abscissa of a mass spectrum, although the quantity measured is not the quotient of the ion's mass to its electric charge.  The three-character symbol ''m/z'' is recommended for the dimensionless quantity that is the independent variable in a mass spectrum
 
 
 
Note 2:  The proposed unit [[thomson]] (Th) is deprecated.
 
  
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Abbreviation representing the dimensionless quantity formed by dividing the ratio of the mass of
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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.
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: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.
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: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.
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:Note 4: The [[thomson]] (Th) unit is deprecated.
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|ref={{obgb}}
 
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{{rev5
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==Orange Book==
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Dimensionless quantity formed by dividing the mass of an ion in unified atomic mass units by its charge number (regardless of sign). The symbol is written in italicized lower case letters with no spaces.
 
 
 
Note 1: mass-to-charge-ratio is deprecated. Mass-to-charge-ratio has been used for the horizontal axis in a plot of a mass spectrum, although the quantity measured is not the ion's mass divided by its electric charge. However, m/z is recommended for the dimensionless quantity that is the independent variable in a mass spectrum.
 
 
 
Note 2: The symbol m/z should not be used as a variable in a mathematical equation, instead, the variables m and q 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 unit thomson (Th) is deprecated.
 
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#[[Gold Book]]
 
#[[Orange Book]]
 
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''m/z'' ratio.
 
''m/z'' ratio.
 
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==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.
 
}}
 
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== See also ==
 
{{Disc}}
 
*[[Mass/Charge Ratio]]
 
*[[Thomson]]
 
*[[Dalton]]
 
*[[Mass]]
 
*[[Mass Number]]
 
 
==External links ==
 
*[[Wikipedia:Mass-to-charge ratio]]
 
  
 
[[Category:Mass]]
 
[[Category:Mass]]
 
[[Category:Units]]
 
[[Category:Units]]
 
{{DEFAULTSORT:M/Z}}
 
{{DEFAULTSORT:M/Z}}

Revision as of 02:47, 8 June 2013