US 12,451,315 B2
Ion guide electrode configurations for polarity-independent ion containment
Michael W. Senko, Sunnyvale, CA (US)
Assigned to Thermo Finnigan LLC, San Jose, CA (US)
Filed by Thermo Finnigan LLC, San Jose, CA (US)
Filed on Jul. 29, 2022, as Appl. No. 17/877,781.
Prior Publication US 2024/0038476 A1, Feb. 1, 2024
Int. Cl. H01J 3/40 (2006.01); H01J 49/06 (2006.01); H01J 49/42 (2006.01)
CPC H01J 3/40 (2013.01) [H01J 49/063 (2013.01); H01J 49/065 (2013.01); H01J 49/4225 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ion guide comprising:
a first surface and a second surface facing one another with a gap therebetween; and
a plurality of electrodes comprising a first arrangement of electrodes on the first surface and a second arrangement of electrodes on the second surface, the first arrangement of electrodes and the second arrangement of electrodes positioned opposite one another and defining an ion containment space in the gap, wherein:
the first arrangement of electrodes comprises first electrodes and second electrodes arranged on the first surface along a longitudinal axis of the ion containment space;
each first electrode comprises:
a first main portion extending from a first side of the ion containment space to a second side of the ion containment space; and
a first edge portion at the first side of the ion containment space, the first edge portion being wider, along the longitudinal axis of the ion containment space, than the first main portion;
the second arrangement of electrodes comprises third electrodes and fourth electrodes arranged on the second surface along the longitudinal axis of the ion containment space;
each fourth electrode comprises:
a fourth main portion extending from the first side of the ion containment space to the second side of the ion containment space; and
a fourth edge portion at the first side of the ion containment space, the fourth edge portion being wider, along the longitudinal axis of the ion containment space, than the fourth main portion;
the first edge portions of the first electrodes are positioned opposite the fourth edge portions of the fourth electrodes; and
the first electrodes and the third electrodes are configured to receive first RF voltages and the second electrodes and the fourth electrodes are configured to receive second RF voltages that are phase-shifted with respect to the first RF voltages.