Difference between revisions of "M/z"
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− | Three-character symbol | + | 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. |
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 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 | ||
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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. | 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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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 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 | + | 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. | Note 4: The unit thomson (Th) is deprecated. |
Revision as of 03:59, 6 June 2010
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Orange Book
ORANGE BOOK DEFINITION
IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979. |
M/z |
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m/z ratio. |
IUPAC 1997 Orange Book Chapter 12 |
Index of Orange Book Terms |
Gold Book
GOLD BOOK DEFINITION
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). |
M/z |
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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_{7}H_{7}^{2+}, m/z equals 45.5. |
IUPAC Gold Book |
Index of Gold Book Terms |
See also
See additional comments on the M/z discussion page (archive of discussion between 2004 and 2006) |