Method and apparatus for providing ion barriers at the...

Details Method and apparatus for providing ion barriers at the... Method and apparatus for providing ion barriers at the...

2007-03-22

2009-02-24

Vanore, David A. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S290000

Reexamination Certificate

active

07495213

ABSTRACT:
There is provided a linear ion trap having an ion guide and a method of operating same. The ion guide has a first end and a second end. The method involves a) providing a first group of ions within the ion guide; b) providing a second group of ions within the ion guide, the second group of ions being opposite in polarity to the first group of ions; c) providing an RF drive voltage to the ion guide to radially confine the first group of ions and the second group of ions in the ion guide; d) providing a gas flow of an inert gas in a first axial direction away from the first end of the ion guide and toward a middle of the ion guide to repel both the first group of ions and the second group of ions from the first end of the ion guide; and, e) providing a trapping region barrier for repelling both the first group of ions and the second group of ions away from the second end of the ion guide. The gas flow in the first axial direction and the trapping region barrier together define a main trapping region for trapping both the first group of ions and the second group of ions.

REFERENCES:
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Written Opinion for International Application No. PCT/CA2007/000467, Jun. 8, 2007.
International Search Report for International Application No. PCT/CA2007/000467.

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