|
|
| Line 1: |
Line 1: |
| {{Def2| | | {{Final |
| Mass of an ion or molecule calculated using the mass of the most abundant isotope of each element rounded to the nearest integer value and equivalent to the sum of the [[mass number]]s of all constituent atoms. | | |acronym= |
| | |def=Mass of a molecular [[ion]] or molecule calculated using the isotope mass of the most abundant constituent element isotope of each element rounded to the nearest integer value and multiplied by the number of atoms of each element. |
| | |rel=[[monoisotopic mass]] |
| | |ref= |
| }} | | }} |
|
| |
| {{rev5|
| |
| [[mass number]]
| |
|
| |
| Mass of an ion or molecule calculated using the isotope mass of the most abundant naturally occurring isotope of each element rounded to the nearest integer value and multiplying by the number of atoms of each element.
| |
|
| |
| Related terms: [[accurate mass]], [[average mass]], [[exact mass]], [[monoisotopic mass]]
| |
| |
| |
| #J. Yergey, D. Heller, G. Hansen, R. J. Cotter, C. Fenselau. Anal. Chem 55, 353-356 (1983).
| |
| }}
| |
|
| |
| == See also ==
| |
| *[[Mass]]
| |
|
| |
| == External links ==
| |
| *[http://www.spectroscopynow.com/Spy/basehtml/SpyH/1,1181,4-14-6-0-0-education_dets-0-2585,00.html Base Peak Glossary]
| |
| :The mass of an ion containing the most abundant isotopes, calculated with nominal atomic weights.??????????????
| |
| *[http://www.rzuser.uni-heidelberg.de/~bl5/ency/ency.html Little Encyclopedia of MS]
| |
| :The nominal mass of an ion is calculated by simply adding the integer masses of the lightest isotopes of all elements contributing to the molecule, e.g. to calculate the nominal mass of CH<sub>3</sub>Br you have to use the nominal masses of <sup>12</sup>C, <sup>1</sup>H, and <sup>79</sup>Br to obtain M<sub>nomi</sub> = 94 [[amu]]
| |
| *[http://www1.shimadzu.com/products/lab/mass/a.html Shimadzu Mass Spectrometry Glossary]
| |
| :Same meaning as [[mass number]] (Nearest integer when expressing the mass of an atom in units that define <sup>12</sup>C as 12. The number is approximately the sum of protons and neutrons in the atomic nucleus. In mass analysis the [[mass number]] is the sum of the masses of the atoms making up an ion or other particle (<sup>12</sup>C = 12, <sup>1</sup>H = 1, <sup>16</sup>O = 16, <sup>14</sup>N = 14...))
| |
|
| |
| {{Disc}}
| |
| {{DiscDef}}
| |
|
| |
|
| [[Category:Mass]] | | [[Category:Mass]] |
| {{DEFAULTSORT:Nominal Mass}} | | {{DEFAULTSORT:Nominal Mass}} |
