Resolution (mass spectrometry): Difference between revisions

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{{Def|The smallest mass difference Δ'''m''' between two equal magnitude peaks such that the valley between them is a specified fraction of the peak height}}
== [[Orange Book]] Definition ==
[[Resolution: 10 Per Cent Valley Definition]]
[[Resolution: 10 Per Cent Valley Definition]]
Let two peaks of equal height in a [[Mass Spectrum|mass spectrum]] at masses m and m - Δm be separated by a valley which at its lowest point is just 10% of the height of either peak. For similar peaks at a mass exceeding m , let the height of the valley at its lowest point be more (by any amount) than 10% of either peak. Then the resolution (10% valley definition) is m / Δm. The ratio m /Δm should be given for a number of values of m.


[[Resolution: Peak Width Definition]]
[[Resolution: Peak Width Definition]]
For a single peak made up of singly charged ions at mass m in a [[Mass Spectrum|mass spectrum]], the resolution may be expressed as m / ?¢ÀÜ?°?É‚Ä??Ǭ¨?Ǭ¢?¢ÀÜ?°?ɬ£?¢‚Ǩ?°?É‚Äû?¢‚Ǩ¬†?¢ÀÜ?°?Ǭ¢?¢‚Ǩ?°?ɂİ?Ǭ®?Ǭ¨?¢‚Ǩ¬†m, where ?¢ÀÜ?°?É‚Ä??Ǭ¨?Ǭ¢?¢ÀÜ?°?ɬ£?¢‚Ǩ?°?É‚Äû?¢‚Ǩ¬†?¢ÀÜ?°?Ǭ¢?¢‚Ǩ?°?ɂİ?Ǭ®?Ǭ¨?¢‚Ǩ¬†m is the width of the peak at a height which is a specified fraction of the maximum peak height. It is recommended that one of three values 50%, 5% or 0.5% should always be used. (Note that for an isolated symmetrical peak recorded with a system which is linear in the range between 5% and 10% levels of the peak, the 5% peak width definition is equivalent to the 10% valley definition. A common standard is the definition of resolution based upon ?¢ÀÜ?°?É‚Ä??Ǭ¨?Ǭ¢?¢ÀÜ?°?ɬ£?¢‚Ǩ?°?É‚Äû?¢‚Ǩ¬†?¢ÀÜ?°?Ǭ¢?¢‚Ǩ?°?ɂİ?Ǭ®?Ǭ¨?¢‚Ǩ¬†m being Full Width of the peak at Half its Maximum (FWHM) height.
== Related Terms ==


[[Resolving Power (Mass)]]
[[Resolving Power (Mass)]]

Revision as of 18:00, 14 January 2005