Efficient detection for ion traps

H - Electricity – 01 – J

Patent

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H01J 49/10 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2648746

An apparatus and method are disclosed for efficient detection of ions ejected from a quadrupolar ion trap, in which the ions are ejected as first and second groups of ions having different directions. The first and second groups of ions are received by a conversion dynode structure, which responsively emits secondary particles that are directed to a shared detector, such as an electron multiplier. The conversion dynode structure may be implemented as a common dynode or as two dynodes (or sets of dynodes), with each dynode positioned to receive one of the groups of ions.

L'invention concerne un appareil et un procédé pour la détection efficace d'ions éjectés d'un piège à ions quadripolaire, dans lequel les ions sont éjectés en tant que premier et deuxième groupe d'ions se dirigeant dans des directions différentes. Les premier et deuxième groupes d'ions sont reçus par une structure de dynode de conversion, qui émet en réponse des particules secondaires qui sont dirigées vers un détecteur partagé, de type multiplicateur d'électrons. La structure de dynode de conversion peut être mise en oeuvre en tant que dynode commun ou sous forme de deux dynodes (ou ensembles de dynodes), chaque dynode étant positionné de façon à recevoir un des groupes d'ions.

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