Ion trap device

Details Ion trap device Ion trap device

2005-12-20

2005-12-20

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000

Reexamination Certificate

active

06977374

ABSTRACT:
An ion trap device, which is composed of a ring electrode and a pair of end cap electrodes, according to the present invention includes a capacitor for adjusting a capacitance between the ring electrode and one of the end cap electrodes so that a fluctuation in the voltage of the ring electrode is suppressed when an ion-ejecting voltage is applied to one or both of the pair of end cap electrodes and ions in the ion trap device are ejected. Instead of using a capacitor device, such an object can be realized by modifying a shape of one of the end cap electrodes. The fluctuation in the voltage of the ring electrode can be suppressed when high DC voltages are applied to the end cap electrodes to eject ions from the ion trap device. This enables endowing ejected ions having different mass to charge ratios with the same energy, which prevents the subsequent mass analyzer using the ejected ions from being influenced by the operation parameters, such as the ion-trapping RF voltage, of the ion trap device, and improves the performances, such as the mass resolution and the sensitivity, of the mass analyzer.

REFERENCES:
patent: 6380666 (2002-04-01), Kawato
patent: 6483244 (2002-11-01), Kawato et al.
patent: 6870159 (2005-03-01), Kawato
patent: 2004/0132083 (2004-07-01), Kawato et al.
patent: 2005/0127291 (2005-06-01), Kawato
Mark G. Qian et al., American Chemical Society, Analytical Chemistry, vol. 67, No. 7, Apr. 1, 1995, pp. 234A-242A.

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