Quadrupole mass spectrometer

Details Quadrupole mass spectrometer Quadrupole mass spectrometer

B - Operations, Transporting

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D

358/9

B01D 59/44 (2006.01) H01J 49/42 (2006.01)

Patent

CA 1251870

TITLE QUADRUPOLE MASS SPECTROMETER INVENTOR PETER HENRY DAWSON ABSTRACT OF THE DISCLOSURE 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) locking amplifier synchronous detection schemes can be used. These give improved signal/noise ratios. Background noise due to photons, soft X-rays or escited neutrals often a problem in quadrupole mass filters will not be modulated and will not be detected. (b) Higher resolution can be achieved.

497422

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