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

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

2008-04-29

2008-04-29

Vanore, David A. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S290000

Reexamination Certificate

active

11477449

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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