Ion trap mass spectrometer

Details Ion trap mass spectrometer Ion trap mass spectrometer

2005-03-01

2005-03-01

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S281000, C250S291000, C250S292000

Reexamination Certificate

active

06861644

ABSTRACT:
In an ion trap mass spectrometer including an ion trap space surrounded by a ring electrode and two end cap electrodes placed opposite each other with the ring electrode between them, a method of trapping object ions of a predetermined mass-to-charge ratio in the ion trap space more assuredly and effectively. The method includes the steps of: applying an RF voltage to the ring electrode to trap the object ions; and applying an auxiliary AC voltage to the end cap electrodes, where the auxiliary voltage has a frequency spectrum with a first notch at the basic frequency of the object ions and a second notch at a a beat frequency. Then the second stage is performed where another auxiliary AC voltage of the beat frequency is applied to the end cap electrodes to expel non-object ions still remaining in the ion trap space.

REFERENCES:
patent: 5200613 (1993-04-01), Kelley
patent: 2000-323090 (2000-11-01), None
patent: 2001-210268 (2001-08-01), None

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