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| resolution in gas chromatography | resolution in optical spectroscopy |
and
be separated by a valley which at its lowest point is just 10 per cent of the height
of either peak. For similar peaks at a mass exceeding 
, let the height of the valley at its lowest point be more (by any amount) than ten
per cent of either peak height. Then the resolution (10 per cent valley definition)
is
.
It is usually a function of 
. The ratio
should be given for a number of values of 
.
in a mass spectrum, the resolution may be expressed as
where
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. 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 technically
equivalent to the 10% valley definition. A common standard is the definition of resolution
based upon
being Full Width of the peak at Half its Maximum height, sometimes abbreviated
'FWHM'.
This acronym should preferably be defined the first time it is used.
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