Quadrupole mass spectrometer

Details Quadrupole mass spectrometer Quadrupole mass spectrometer

1986-06-23

1988-01-26

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250292, B01D 5944

Patent

active

047218541

ABSTRACT:
This disclosure presents an alternative, improved approach to the RF only quadrupole mass spectrometers. The ions whose masses place them near the stability limit for a given operating voltage and RF frequency, can be strongly influenced by the application of a very small dc voltage to the quadrupole rods. If this voltage is modulated at a low frequency (typically a few hundred hertz), the (a,q) values will pass alternately through the stability boundary and ions will be transmitted with the imposed frequency. The advantages of the new approach are two-fold (a) lock-in amplifier synchronous detection schemes can be used. These give improved signal
oise ratios. Background noise due to photons, soft X-rays or excited neutrals--often a problem in quadrupole mass filters--will not be modulated and will not be detected. (b) Higher resolution can be achieved.

REFERENCES:
patent: 3920986 (1975-11-01), Fies
patent: 3935452 (1976-01-01), Prince
patent: 4090075 (1978-05-01), Brinkmann
patent: 4189640 (1980-02-01), Dawson
patent: 4535236 (1985-08-01), Batey

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