Nominal mass: Difference between revisions

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== Proposed Entry ==
The mass of an ion in atomic mass units rounded to the nearest integer.
: ''M'' = n '''Da''' = round(''m'')
The concept of nominal mass is useful because the mass of (small) molecules is always very close to their nominal mass. Many types of mass spectrometers do not have sufficient resolving power to distinguish molecules with the same nominal mass. For example CO and N2 both have the same nominal mass ''M'' = 28 and cannot be resolved by many mass spectrometers even though the accurate mass ''m'' is slightly different for the two molecules.
See also [[Accurate Mass]], [[Average Mass]], [[Atomic Mass Unit]], [[Dalton]].
See also [[Accurate Mass]], [[Average Mass]], [[Atomic Mass Unit]], [[Dalton]].



Revision as of 14:14, 6 January 2005