(under subclass 281) Subject matter wherein the ion selecting means comprises means for varying at regular intervals the direction or magnitude of an electric or magnetic field.
(1) Note. The fields involved in the subject matter of this subclass are generally for intermittently accelerating ions or causing them to oscillate, the average velocity of the accelerated ions and the frequency of the oscillating ions being functions of the fields and the charge-to-mass ratio of the ions. Cyclically varying field means in ionic separation or analysis apparatus are not necessarily classifiable here. See search notes below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
286, for cyclically varying beam pulsing means external to the selecting means and in combination with magnetic selecting means for varying the radii of the separated ion paths.
295, for cyclically varying ion accelerating means in combination with magnetic selecting means for varying the radii of the separated ion paths.
