An ion which is not sufficiently excited to dissociate spontaneously into a daughter
ion and associated neutral fragment(s) or to react further in any other way within
the time scale of the experiment, e.g. until hitting the detector.
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 1550