A @M03732@ in which the separation of a selected ion beam depends essentially on the use of fields, or a field, varying with time. These fields are generally electric.
Sources: Orange Book, 2nd ed., p. 202 [Terms] [Book] 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]