Mass spectrometer

Details Mass spectrometer Mass spectrometer

H - Electricity

01

J

H01J 49/42 (2006.01)

Patent

CA 2586519

A mass spectrometer is disclosed comprising a quadrupole rod set ion guide or mass filter device (6). A broadband frequency signal (10) having one or more notches (11a, 11b, 11c) is applied to the rods of the quadrupole rod set (6). The notched broadband frequency signal (10) causes undesired ions to be resonantly ejected from the ion guide (6). The notched broadband frequency signal (10) has frequency components missing which correspond with the resonance frequency of ions which are desired to be onwardly transmitted. The ion guide or mass filter device (6) enables a plurality of desired ions having different mass to charge ratios to be simultaneously transmitted by the ion guide or mass filter device (6) whilst other ions are resonantly ejected from the ion guide or mass filter device (6).

Cette invention concerne un spectromètre de masse comprenant un dispositif de type guide d'ions à ensemble de tiges ou filtre de masse quadripolaire (6). Un signal de fréquence large bande (10) ayant un ou plusieurs creux (11a, 11b, 11c) est appliqué aux tiges de l~ensemble de tiges quadripolaire (6). Le signal de fréquence large bande cranté (10) provoque l~éjection par résonance des ions indésirables du guide d~ions (6). Le signal (10) possède des éléments de fréquence absents qui correspondent à la fréquence de résonance des ions que l~on souhaite retransmettre. Le dispositif de type guide d'ions ou filtre de masse (6) permet la transmission simultanée d~une pluralité d~ions voulus ayant différents rapports masse/charge, tandis que les autres ions font l~objet d~une éjection par résonance du dispositif (6).

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