Ion trap mass spectrometer system and method

Details Ion trap mass spectrometer system and method Ion trap mass spectrometer system and method

1994-05-27

1995-05-30

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250291, 250283, 250282, H01J 4942

Patent

active

054204259

ABSTRACT:
The present invention relates generally to an ion trap mass spectrometer for analyzing ions and more particularly to a substantially quadrupole ion trap mass spectrometer with an enlarged ion occupied volume. Described herein are electrode geometries that enlarge the ion occupied volume. Improved ion sensitivities, detection limits and dynamic range should be realized for the same charge density in these devices because the increased ion occupied volume allows for the storage of a greater number of ions. The essence of this invention is that these ion trap geometries may apply all modes of operation of substantially quadrupole ion traps such as the mass selective instability mode, resonance excitation/ejection, and MS.sup.n.

REFERENCES:
patent: 3555273 (1971-01-01), Arnold
patent: 4540884 (1985-09-01), Stafford et al.
patent: 5206506 (1993-04-01), Kirchner
Ion Confinement in the Collision Cell of a Multiquadrupole Mass Spectrometer 1989 American Chemical Society, pp. 1447-1453.
Quadrupole Mass Spectrometry, P. H. Dawson.
Laser Photodissociation Probe for Ion Tomography Studies in a Quadrupole Ion-Trap Mass Spectrometer, Chem. Phys Letters, vol. 191, No. 5, pp. 405-410.
Ion-Trapping Technique for Ion/Molecular Reaction Studies in the Center Quadrupole of a Triple Quadrupole Mass Spectrometer, Int. Jrnl. of Mass Spectrometry, 82 (1988).
Storage-Ring Ion Trap Derived from the Linear Quadrupole Radio-Frequency Mass Filter, Church, Jrnl. of Applied Physics, vol. 40, pp. 3127-3134.

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