Resolution: peak width definition

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Orange Book

ORANGE BOOK DEFINITION

IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the “Orange Book”). Definitive Rules, 1979.

Resolution: peak width definition

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 ∆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 ∆m being Full Width of the peak at Half its Maximum (FWHM) height.

IUPAC Orange Book Chapter 12
Index of Orange Book Terms