Method of operating an ion trap mass spectrometer

H - Electricity – 01 – J

Patent

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H01J 49/42 (2006.01)

Patent

CA 2245826

A method of operating a quadrupole ion trap as a mass spectrometer, in which the ion mass to be detected is selected by adjusting the three-dimensional quadrupole storage field to make the .beta.z value of the selected mass equal to a fixed, predetermined .beta.z value of a narrow range of frequencies excluded from a broadband supplemental RF electric field. The ions are detected to provide a signal corresponding to the amount of the selected ion mass.

Cette invention concerne un procédé de fonctionnement d'un piège à ions quadripôle utilisé en qualité de spectromètre de masse. La masse ionique devant être mesurée est choisie en ajustant le champ de stockage quadripôle tridimensionnel. Ce champ est ajusté de manière à ce que la valeur .beta.¿z? de la masse choisie soit égale à la valeur .beta.¿z? fixe et prédéterminée d'une plage étroite de fréquences qui ont été exclues d'un champ électrique supplémentaire et à bande large. Les ions sont ensuite mesurés de manière à obtenir un signal qui correspond à la quantité de la masse ionique choisie.

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