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

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#REDIRECT [[resolving power]]
01-30-2004 04:17 PM ET (US)
 
 
 
[[ASMS Terms and Definitions Poster]] has "mass resolving power - m/Dmx, where Dmx is the mass resolution "
 
 
 
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02-28-2004 01:33 AM ET (US)
 
 
 
It should be noted that since Resolving Power is dimensionless, a specified mass/charge value should always be referenced for a given Resolving Power, i.e.- 5,000 Resolving Power for m/z 500. This allows for extrapolation across a broad mass range, such as the over all range of the MS instrument.
 
 
 
 
 
 
== [[ASMS Terms and Definitions Poster]] Entry ==
 
 
 
Resolution of the Confusion on Peak Separation
 
 
 
Mass resolving power and mass resolution have been used interchangeably throughout the literature, so the confusion surrounding their exact meaning is understandable.  In his forthcoming book, "Guide to Mass Spectrometry," Ken Busch advocates definitions that are consistent these proposed terminologies for mass resolution and mass resolving power.  In most disciplines, resolution is understood to be the smallest observable change in a quantity, whereas resolving power, i.e. the ability to distinguish two closely spaced quantities, is inversely proportional to resolution.
 
Proposed definitions:
 
mass resolution
 
 
 
 
See Usage Note for mass resolving power and theoretical mass resolving power
 
mass resolving power
 
 
 
 
 
 
See Usage Note for theoretical mass resolving power
 
 
 
 
 
 
(moved from front page)
 
 
 
: -- [[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.
 
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<!-- 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.
 
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<!-- 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
 
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{{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 11:33, 14 June 2013

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