Ion trap mass spectrometer

Details Ion trap mass spectrometer Ion trap mass spectrometer

2005-01-25

2005-01-25

Berman, Jack I. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

Reexamination Certificate

active

06847037

ABSTRACT:
In an ion trap mass spectrometer including a ring electrode and a pair of end cap electrodes placed opposite each other with the ring electrode therebetween, where an ion trap space is defined by the ring electrode and the pair of end cap electrodes, the frequency determining section of the controller determines a plurality of frequencies or a plurality of frequency channels each corresponding to a mass to charge ratio of an ion to be selected. The wide-band RF signal generator generates a wide-band RF signal having a plurality of notches each corresponding to each of the plurality of frequencies or the plurality of frequency channels. Then the voltage controller applies a voltage corresponding to the wide-band RF voltage to the pair of end cap electrodes, whereby ions having mass to charge ratios corresponding to the frequencies or frequency channels remain in the ion trap space but other ions are ejected from the ion trap space.

REFERENCES:
patent: 4761545 (1988-08-01), Marshall et al.
patent: 5449905 (1995-09-01), Hoekman et al.
patent: 6624411 (2003-09-01), Umemura
patent: 20010010355 (2001-08-01), Umemura
patent: 20030071211 (2003-04-01), Kawato
patent: 2001-210268 (2001-08-01), None
patent: 2003-45372 (2003-02-01), None

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