Method for providing barrier fields at the entrance and exit...

Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means

Reexamination Certificate

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C250S282000, C250S290000

Reexamination Certificate

active

07365319

ABSTRACT:
A method and apparatus for trapping or guiding ions is provided. The ion trap or ion guide includes a first set of electrodes and a second set of electrodes, the first set of electrodes defining a first portion of an ion channel to trap or guide the introduced ions. In operation, periodic voltages are applied to electrodes in the first set of electrodes to generate a first oscillating electric potential that radially confines the ions in the ion channel, while periodic voltages are applied to electrodes in the second set of electrodes to generate a second oscillating electric potential that axially confines the ions in the ion channel.

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