Quadrupole mass filter

Details Quadrupole mass filter Quadrupole mass filter

2005-09-06

2005-09-06

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S290000, C250S281000, C250S282000, C250S283000, C250S286000

Reexamination Certificate

active

06940068

ABSTRACT:
Apparatus and method to improve the filtering action of a quadrupole mass filter by reducing a precursor fault caused by an asymmetric electrical field between a pair of opposing electrode rods in a y-axis of the quadrupole mass filter. Processing means for processing detector data determine the filtering action of the quadrupole mass filter by checking for a precursor fault. If a precursor fault is detected then power supply control means introduce an AC potential difference across the electrode rods in the y-axis in order to reduce asymmetry in the electrical field in the y-axis.

REFERENCES:
patent: 3725700 (1973-04-01), Turner
patent: 4214160 (1980-07-01), Fies et al.
patent: 5089703 (1992-02-01), Schoen et al.
patent: 5187365 (1993-02-01), Kelley
patent: 6028308 (2000-02-01), Hager
patent: 6-325731 (1994-11-01), None
patent: 8-102283 (1996-04-01), None

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