.~ Cyclically varying ion selecting field means {3}
293
.~.~ Alternating field ion selecting means
DEFINITION
Classification: 250/293
(under subclass 290) Subject matter wherein the ion selecting means includes a polarized field whose direction of polarization changes cyclically.
(1) Note. Means producing selecting fields which vary in magnitude cyclically but not in direction are not classified in this subclass, but in 290 above. The field means classified here tend to produce oscillations of the ions rather than intermittent unidirectional accelerations.
