Molecular ion: Difference between revisions
From Mass Spec Terms
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== Gold Book | == Gold Book entry == | ||
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[http://www.nicmila.org/Gold/Output/M03988.xhtml molecular ion] | [http://www.nicmila.org/Gold/Output/M03988.xhtml molecular ion] | ||
An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occuring isotopes of the various atoms that make up the molecule (with a correction for the masses of the electron(s) lost or gained). For example, the mass of the molecular ion of ethyl bromide C<sub>2</sub>H<sub>5</sub> <sup>79</sup>Br will be plus 51.0078246 plus 78.91839 minus the mass of the electron (''m<sub>e</sub>''). This is equal to 107.95751 u - ''m<sub>e</sub>'', being the unified atomic mass unit based on the standard that the mass of the isotope <sup>12</sup>C = 12u exactly. | An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occuring isotopes of the various atoms that make up the molecule (with a correction for the masses of the electron(s) lost or gained). For example, the mass of the molecular ion of ethyl bromide C<sub>2</sub>H<sub>5</sub> <sup>79</sup>Br will be plus 51.0078246 plus 78.91839 minus the mass of the electron (''m<sub>e</sub>''). This is equal to 107.95751 u - ''m<sub>e</sub>'', being the unified atomic mass unit based on the standard that the mass of the isotope <sup>12</sup>C = 12u exactly. | ||
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==Related Terms == | ==Related Terms == | ||
*[[Isotopologue Ion]] | *[[Isotopologue Ion]] | ||
*[[Isotope Cluster Ion]] | *[[Isotope Cluster Ion]] | ||
*[[Mass]] | *[[Mass]] | ||
*[[Nominal Mass]] | *[[Nominal Mass]] | ||
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[[Category:Orange book term]] | [[Category:Orange book term]] | ||
{{DEFAULTSORT:Molecular Ion}} | {{DEFAULTSORT:Molecular Ion}} | ||
[[Category:Gold Book term]] | |||
Revision as of 14:05, 12 July 2009
Obsolete Template
Orange Book entry
Orange Book
| ORANGE BOOK DEFINITION
IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023) |
| Molecular ion |
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An ion formed by the removal from (positive ions) or addition to (negative ions) a molecule of one or more electrons without fragmentation of the molecular structure. The mass of this ion corresponds to the sum of the masses of the most abundant naturally occurring isotopes of the various atoms that make up the molecule, with a correction for the masses of the electrons lost or gain. |
| IUPAC 1997 Orange Book Chapter 12 |
| Index of Orange Book Terms |
Gold Book entry
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). |
| Molecular ion |
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| {{{1}}} |
| IUPAC Gold Book |
| Index of Gold Book Terms |
