Quadrupole with applied signal having off-resonance frequency

Details Quadrupole with applied signal having off-resonance frequency Quadrupole with applied signal having off-resonance frequency

H - Electricity

01

J

H01J 49/26 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2166207

A mass spectrometry method in which a combined field (comprising a trapping field and supplemental field) is established and at least one parameter of the combined field is changed to excite ions trapped in the combined field sequentially (such as for detection). The supplemental field is a periodically varying field having an off-resonance frequency, in the sense that the supplemental field frequency nearly matches (but differs from) a frequency of motion of an ion stably trapped by the trapping field alone. Sequential ion excitation in accordance with the invention can rapidly excite each ion to a degree sufficient for a desired purpose but insufficient for ejection from the trap. The amplitude of the supplemental field is kept sufficiently high to excite ions (via an off-resonance excitation mechanism) before they undergo resonant excitation.

Selon un procédé de spectrométrie de masse, un champ combiné (qui comprend un champ piège et un champ supplémentaire) est établi et au moins un paramètre du champ combiné est modifié afin d'exciter successivement les ions piégés dans le champ combiné (à des fins de détection, par exemple). Le champ supplémentaire est un champ périodiquement variable ayant une fréquence hors résonance, en ce sens que la fréquence du champ supplémentaire correspond presque à une fréquence de déplacement d'un ion piégé de manière stable par le seul champ piège mais diffère de ladite fréquence. L'excitation successive d'ions selon l'invention permet d'exciter rapidement chaque ion jusqu'à un degré suffisant pour l'objectif voulu mais insuffisant pour l'expulser du piège. L'amplitude du champ supplémentaire est maintenue à un niveau suffisamment élevé pour exciter les ions (au moyen d'un mécanisme d'excitation hors résonance) avant qu'ils ne soient excités par résonance.

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