Difference between revisions of "Resolution (mass spectrometry)"

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(clean up using AWB)
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==Controversy==
 
==Controversy==
IUPAC and ASMS 1991 ([[Price 1991]]) define resolution as m/Δm.  
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IUPAC and ASMS 1991 ([[Price 1991]]) define resolution as m/?m.  
  
ASMS 1997 ([[Voyksner 1997]]), Marshall ([[Marshall 2002]]), Sparkman ([[Sparkman 2006]]) define resolution as Δm and resolving power as m/Δm.
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ASMS 1997 ([[Voyksner 1997]]), Marshall ([[Marshall 2002]]), Sparkman ([[Sparkman 2006]]) define resolution as ?m and resolving power as m/?m.
  
 
==Gold Book==
 
==Gold Book==
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From [[Standard Definitions of Terms Relating to Mass Spectrometry : A report from the Committee on Measurements and Standards of the American Society for Mass Spectrometry]]:
 
From [[Standard Definitions of Terms Relating to Mass Spectrometry : A report from the Committee on Measurements and Standards of the American Society for Mass Spectrometry]]:
  
'''Resolution: 10% valley definition''', m/Δm. Let two peaks of equal height in a mass spectrum at masses m and m-ΔΔm. It is usually a func- tion of m, therefore m/Δm should be given for a number of values of m.  
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'''Resolution: 10% valley definition''', m/?m. Let two peaks of equal height in a mass spectrum at masses m and m-??m. It is usually a func- tion of m, therefore m/?m should be given for a number of values of m.  
  
'''Resolution: peak width definition''', m/Δm. For a single peak made up of singly charged ions at mass m in a mass spectrum, the resolution may be expressed as m/Δm, where Am is the width of the peak at a height that is a specified fraction of the maximum peak height. It is recommended that one of three values 50%, 5%, or 0.5% be used. For an isolated symmetrical peak, recorded with a system that is linear in the range between 5% and 10% levels of the peak, the 5% width defmition is technically equivalent to the Photo-ionization. 10% valley defmition. A common standard is the definition of resolution based upon Δ
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'''Resolution: peak width definition''', m/?m. For a single peak made up of singly charged ions at mass m in a mass spectrum, the resolution may be expressed as m/?m, where Am is the width of the peak at a height that is a specified fraction of the maximum peak height. It is recommended that one of three values 50%, 5%, or 0.5% be used. For an isolated symmetrical peak, recorded with a system that is linear in the range between 5% and 10% levels of the peak, the 5% width defmition is technically equivalent to the Photo-ionization. 10% valley defmition. A common standard is the definition of resolution based upon ?
  
 
'''Resolving power (mass)'''. The ability to distinguish between ions differing slightly in mass-to-charge ratio. 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, specihcally for 50% and for 5% of the maximum peak height.
 
'''Resolving power (mass)'''. The ability to distinguish between ions differing slightly in mass-to-charge ratio. 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, specihcally for 50% and for 5% of the maximum peak height.
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[[Category:Resolution]]
 
[[Category:Resolution]]
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{{DEFAULTSORT:Resolution (Mass Spectrometry)}}

Revision as of 01:07, 14 July 2009