System and method for implementing balanced RF fields in an...

Details System and method for implementing balanced RF fields in an... System and method for implementing balanced RF fields in an...

2008-04-29

2008-04-29

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S283000, C250S290000

Reexamination Certificate

active

07365318

ABSTRACT:
A system and method are disclosed for effectively compensating for an unbalanced or non-zero centerline radio-frequency potential in a quadrupolar ion trap, the unbalanced centerline potential created by a compensation feature that minimizes non-linear field components created by one or more ejection slots in the ion trap. The ion trap includes a centerline that passes longitudinally through a trapping volume inside of the ion trap, a pair of Y electrodes with inner Y electrode surfaces that are approximately parallel to the centerline, and a pair of X electrodes with inner X electrode surfaces that are approximately parallel to the centerline. The X electrodes have ejection slots through which trapped ions are ejected from the ion trap. A Y signal with a Y signal amplitude is coupled to both of the Y electrodes. An X signal with an X signal amplitude is coupled to both of the X electrodes. The X signal amplitude is selected to be greater than the Y signal amplitude to thereby create a balanced centerline potential at the centerline of the ion trap device.

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John E. P. Syka, “Commercialization of the Quadrupole Ion Trap,” Pratical Aspects of Ion Trap Mass Spectrometry, CRC Press, Inc., p. 169-205, (1995).

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