Two-dimensional radial-ejection ion trap operable as a...

H - Electricity – 01 – J

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H01J 49/42 (2006.01)

Patent

CA 2736120

A two-dimensional radial-ejection ion trap is constructed from four apertured electrodes having inwardly facing hyberbolic surfaces, with each electrode being spaced from the centerline by a distance r that is greater than the hyperbolic radius redefined by the hyperbolic surfaces. This geometry produces a balanced symmetrical trapping field that has a negligible octopole field component and a relatively large dodecapole or icosapolar field component. In one specific implementation, the ion trap is selectably operable as a quadrupole mass filter by applying a filtering DC voltage to the electrodes.

La présente invention porte sur un piège à ions à éjection radiale bidimensionnel, qui est construit à partir de quatre électrodes pourvues dune ouverture et de surfaces hyperboliques tournées vers l'intérieur, chaque électrode étant espacée de la ligne centrale d'une distance r qui est supérieure au rayon hyperbolique r0 défini par les surfaces hyperboliques. La géométrie produit un champ de piégeage symétrique équilibré qui a une composante de champ octopolaire négligeable et une composante de champ dodécapolaire ou icosapolaire relativement importante. Dans une mise en uvre spécifique, le piège à ions peut être mis en uvre sélectivement en tant que filtre de masse quadripolaire par application d'une tension de courant continu de filtrage aux électrodes.

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