Method and apparatus for mass analysis in a multipole mass spect

Details Method and apparatus for mass analysis in a multipole mass spect Method and apparatus for mass analysis in a multipole mass spect

1991-05-16

1992-02-18

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, 250291, 250281, 250282, H01J 4942, B01D 5944

Patent

active

050897039

ABSTRACT:
Apparatus and method for mass analysis with improved resolution in an r.f.-only multipole mass spectrometer by use of a supplemental r.f. field which resonantly renders ions unstable. Further, the r.f. field is frequency modulated and the output signal demodulated for mass analysis.

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Weaver et al., "Modulation Techniques Applied to Quadrupole Mass Spectrometry", 1978, pp. 41-54.

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