Talk:Resolving power (in mass spectrometry): Difference between revisions
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=Other versions= | |||
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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. | |||
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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. | |||
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'''Resolving power (mass spectrometry)''' | |||
http://goldbook.iupac.org/R05321.html | |||
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 at fifty percent and at five percent of the maximum peak height. | |||
'''mass resolving power''' | |||
http://goldbook.iupac.org/M03730.html | |||
Commonly and also acceptably defined in terms of the overlap (or 'valley') between two peaks. Thus for two peaks of equal height, masses and , when there is overlap between the two peaks to a stated percentage of either peak height (10% is recommended), then the resolving power is defined as . The percentage overlap (or 'valley') concerned must always be stated. | |||
'''Source''': | |||
PAC, 1978, 50, 65 ([[Recommendations for symbolism and nomenclature for mass spectroscopy]]) on page 72 | |||
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== See also == | |||
*[[Resolution (mass spectrometry)]] | |||
== External links == | |||
*[[Reference:Marshall 2002]] gives the following definitions: | |||
:'''Mass peak width (Δm<sub>50%</sub>)''' | |||
::Full width of mass spectral peak at half-maximum peak height | |||
:'''Mass resolving power (m/Δm<sub>50%</sub>)''' | |||
::A well-isolated single mass spectral peak | |||
:'''Mass resolution (m<sub>2</sub> m<sub>1</sub> in Da, or (m<sub>2</sub> m<sub>1</sub>)/m<sub>1</sub> 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 | |||
* [http://www.jeol.com/ms/docs/resolution.html JEOL Resolution Tutorial] | |||
