An arrangement using the fact that ions of different mass/charge need different times
to travel through a certain distance in a field-free region after they have all been
initially given the same translational energy.
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 1546