Radiant energy – Ionic separation or analysis – Methods
Reexamination Certificate
2011-05-24
2011-05-24
Souw, Bernard E (Department: 2881)
Radiant energy
Ionic separation or analysis
Methods
C250S281000, C250S282000
Reexamination Certificate
active
07947948
ABSTRACT:
A two-dimensional radial-ejection ion trap is constructed from four apertured electrodes having inwardly facing hyberbolic surfaces, with each electrode being spaced from the centerline by a distance r that is greater than the hyperbolic radius r0defined by the hyperbolic surfaces. This geometry produces a balanced symmetrical trapping field that has a negligible octopole field component and a relatively large dodecapole or icosapolar field component. In one specific implementation, the ion trap is selectably operable as a quadrupole mass filter by applying a filtering DC voltage to the electrodes.
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Katz Charles B.
Souw Bernard E
Thermo Funnigan LLC
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