Mass selective notch filter with quadrupole excision fields

Details Mass selective notch filter with quadrupole excision fields Mass selective notch filter with quadrupole excision fields

1995-12-18

1997-09-30

Anderson, Bruce

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250282, B01D 5944, H01J 4900

Patent

active

056728700

ABSTRACT:
A notch filter for selectively removing a target ion with a specific mass-to-charge ratio from an ion beam is provided. The notch filter uses a quadrupole and a power supply for generating an rf electrical potential in the quadrupole. The quadrupole has two pairs of parallel electrodes of opposite polarities. Each pair is comprised of two parallel electrodes having equal electrical potential. The rf electrical potential generated by the power supply is a superposition of an rf quadrupole frequency component and an excision frequency component. The quadrupole has an inlet end and an outlet end and the ion beam traverses from the inlet end to the outlet end. As a result of the rf quadrupole frequency component, ions of above a selected mass-to-charge ratio are guided down the quadrupole. The excision frequency component, which is at the second harmonic of the dominant resonant frequency of the target ion, causes the target ion to resonate and be removed from the ion beam before exiting the quadrupole.

REFERENCES:
patent: 3334225 (1967-08-01), Langmuir
patent: 4535236 (1985-08-01), Batey
patent: 4652753 (1987-03-01), Shiokawa
patent: 4721854 (1988-01-01), Dawson
patent: 4736101 (1988-04-01), Syka et al.
patent: 4885500 (1989-12-01), Hansen et al.
patent: 5089703 (1992-02-01), Schoen et al.
patent: 5134286 (1992-07-01), Kelly
patent: 5187365 (1993-02-01), Kelley
patent: 5345078 (1994-09-01), Kelley
patent: 5365064 (1994-11-01), Rettinghaus
patent: 5449905 (1995-09-01), Hoekman et al.
patent: 5468957 (1995-11-01), Franzen
patent: 5598001 (1997-01-01), Flory et al.
Reinsfelder et al., "Theory and Characterization of a Separator Analyzer Mass Spectrometer", 1981, vol. 37, pp. 241-250, International Journal of Mass Spectrometry and Ion Physics.
Miller et al., "A Notch Rejection Quadrupole Mass Filter", 1990, vol. 96, pp. 17-26, International Journal of Mass Spectrometry and Ion Processes.

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