Difference between revisions of "Talk:Resolving power (in mass spectrometry)"

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: -- [[User:Kkmurray|K. Murray]] 15:46, 14 Jan 2005 (CST)
 
: -- [[User:Kkmurray|K. Murray]] 15:46, 14 Jan 2005 (CST)
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=Other versions=
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{{Def2|
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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)'''
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http://goldbook.iupac.org/R05321.html
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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 at fifty percent and at five percent of the maximum peak height.
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'''mass resolving power'''
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http://goldbook.iupac.org/M03730.html
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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.
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'''Source''':
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PAC, 1978, 50, 65 ([[Recommendations for symbolism and nomenclature for mass spectroscopy]]) on page 72
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== See also ==
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*[[Resolution (mass spectrometry)]]
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== External links ==
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*[[Reference:Marshall 2002]] gives the following definitions:
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:'''Mass peak width (&#916;m<sub>50%</sub>)'''
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::Full width of mass spectral peak at half-maximum peak height
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:'''Mass resolving power (m/&#916;m<sub>50%</sub>)'''
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::A well-isolated single mass spectral peak
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:'''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)'''
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::The smallest mass difference between equal magnitude peaks such that the valley between them is a specified fraction of either peak height
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:'''Mass precision'''
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::Root-mean-square deviation in a large number of repeated measurements
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:'''Mass accuracy'''
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::Difference between measured and actual mass
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:'''Mass defect'''
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::Difference between exact and nominal mass
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* [http://www.jeol.com/ms/docs/resolution.html JEOL Resolution Tutorial]

Revision as of 21:35, 11 October 2012

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