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

From MS Terms
No edit summary
Line 36: Line 36:


: -- [[User:Kkmurray|K. Murray]] 15:46, 14 Jan 2005 (CST)
: -- [[User:Kkmurray|K. Murray]] 15:46, 14 Jan 2005 (CST)
=Other versions=
{{Def2|
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 -->
{{orange|
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.
}}
<!-- Gold Book -->
{{gold|
'''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
}}
{{ProblemTerm}}
== See also ==
*[[Resolution (mass spectrometry)]]
== External links ==
*[[Reference:Marshall 2002]] gives the following definitions:
:'''Mass peak width (&#916;m<sub>50%</sub>)'''
::Full width of mass spectral peak at half-maximum peak height
:'''Mass resolving power (m/&#916;m<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]

Revision as of 17:35, 11 October 2012