The ratio of intensity of a separated ion beam to the intensity of the separated ion
beam which has the greatest intensity. This ratio is generally equated to the normalized
ratio of the heights of the respective peaks in the
mass spectrum, with the height of the base peak being taken as 100.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1554