double-focusing mass spectrometer

https://doi.org/10.1351/goldbook.D01845
An instrument which uses both direction and velocity focusing, and therefore an ion beam of a given mass/charge is brought to a focus when the ion beam is initially diverging and contains ions of the same mass and charge with different translational energies. The ion beam is measured electrically.
Sources:
Orange Book, 2nd ed., p. 201 [Terms]
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 1545 [Terms] [Paper]