Resolving power (in mass spectrometry): Difference between revisions
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{{Def|Mass Resolving Power| | {{Def|Mass Resolving Power|In a [[mass spectrum]], the observed mass divided by the difference between two masses that can be separated: '''m'''/Δ'''m'''. The method by which Δ'''m''' was obtained and the mass at which the measurement was made should be reported.}} | ||
== [[Orange Book]] Entry == | == [[Orange Book]] Entry == | ||
The ability to distinguish between ions differing in the quotient mass/charge by a small increment. It may be characterized by giving the peak width, measured in mass units, expressed as a function of mass, for at least two points on the peak, specifically for 50% and for 5% of the maximum peak height. | The ability to distinguish between ions differing in the quotient mass/charge by a small increment. It may be characterized by giving the peak width, measured in mass units, expressed as a function of mass, for at least two points on the peak, specifically for 50% and for 5% of the maximum peak height. | ||
== External Links == | == External Links == | ||
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:'''Mass defect''' | :'''Mass defect''' | ||
::Difference between exact and nominal mass | ::Difference between exact and nominal mass | ||
[http://www.jeol.com/ms/docs/resolution.html JEOL Resolution Tutorial] | |||
Revision as of 17:49, 14 January 2005
| DRAFT DEFINITION |
| Resolving power (in mass spectrometry) |
|---|
| Related Term(s): |
| Reference(s): |
| This is an unofficial draft definition presented for information and comment. |
Orange Book Entry
The ability to distinguish between ions differing in the quotient mass/charge by a small increment. It may be characterized by giving the peak width, measured in mass units, expressed as a function of mass, for at least two points on the peak, specifically for 50% and for 5% of the maximum peak height.
External Links
Reference:Marshall 2002 gives the following definitions:
- Mass peak width (Δm50%)
- Full width of mass spectral peak at half-maximum peak height
- Mass resolving power (Δm/m50%)
- A well-isolated single mass spectral peak
- Mass resolution (m2 ?????????????????????????? m1 in Da, or (m2 ?????????????????????????? m1)/m1 in ppm)
- The smallest mass difference between equal magnitude peaks such that the valley between them is a specified fraction of either peak height
- Mass precision
- Root-mean-square deviation in a large number of repeated measurements
- Mass accuracy
- Difference between measured and actual mass
- Mass defect
- Difference between exact and nominal mass
