Method of detecting the ions in an ion trap mass spectrometer

H - Electricity – 01 – J

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

Patent

CA 2094869

A method is disclosed for operating an ion trap mass spectrometer in such a way as to distinguish resonantly ejected ions from non-resonantly ejected ions. A supplementary AC field is super imposed on the three-dimensional quadrupole trapping field andthe combined fields are scanned to resonantly eject ions of consecutive mass-to-charge ratio. The ejected ions are detected and the output signal of the resonantly ejected ions has a frequency component at the frequency of the supplementary AC field.

Une méthode est divulguée pour opérer un spectromètre de masse à piège à ions de telle manière à ce que ce dernier puisse distinguer les ions émis de façon résonnante de ceux émis de façon non résonnante. Un champ alternatif supplémentaire est superposé sur le champ de piégeage quadripolaire à trois dimensions, et les champs combinés sont balayés pour émettre des ions de façon résonnante ayant un rapport consécutif masse:charge. Les ions émis sont détectés, et le signal de sortie des ions émis de façon résonnante possède une composante de fréquence réglée à la fréquence du champ alternatif supplémentaire.

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