CPC H01J 49/062 (2013.01) [H01J 49/063 (2013.01); H01J 49/42 (2013.01)] | 19 Claims |
1. An ion guide comprising:
a plurality of curved electrodes arranged along a curved central axis, wherein the plurality of electrodes define a curved ion guide region, the curved ion guide region beginning at an ion entrance and ending at an ion exit; and
an ion deflecting device configured to apply a radial DC electric field across the ion guide region and along the curved central axis,
wherein the ion guide region has a radius of curvature that varies along the curved central axis, and wherein the radius of curvature is at a maximum at the ion entrance and decreases along the curved central axis toward the ion exit such that the radius of curvature is at a minimum at the ion exit.
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