Quadrupole mass spectrometer

Details Quadrupole mass spectrometer Quadrupole mass spectrometer

1978-11-27

1980-02-19

Dixon, Harold A.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250305, 250396ML, B01D 5944, H01J 3900

Patent

active

041896408

ABSTRACT:
The quadrupole mass spectrometer has four conventional rod-shaped poles symmetrically located about the ion injection axis. Opposite pairs of rods are interconnected and connected to an rf voltage source. A shield having a circular aperture is located at the output end of the rods to assure the stoppage of low mass particles. In addition, a stopping element also preferably circular is located on the axis at the output to assure the stoppage of heavy particles. A pair of grids incorporating the stopping element, are sequentially located at the output, normal to the axis, the first is connected to a dc voltage source to accelerate the remaining particles through the fringing field of the quadrupole and the second is connected to a dc voltage source to subsequently decelerate the particles.

REFERENCES:
patent: 3617736 (1971-11-01), Barnett
patent: 3710103 (1973-01-01), Helmer
patent: 3784814 (1974-01-01), Sakai et al.
patent: 4146787 (1979-03-01), Fite

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