Mass spectrometer

H - Electricity – 01 – J

Patent

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H01J 49/42 (2006.01)

Patent

CA 2692079

A mass spectrometer is disclosed comprising a quadrupole rod set ion trap (2, 3) wherein a potential field is creat-ed at the exit of the ion trap (4, 5) which decreases with increasing radius in one radial direction. Ions within the ion trap (2, 3) are mass selectively excited in a radial direction. Ions which have been excited in the radial direction experience a potential field which no longer confines the ions axially within the ion trap but which instead acts to extract the ions and hence causes the ions to be ejected axially from the ion trap (2, 3).

Un spectromètre de masse est décrit et comprend un piège à ions à ensemble de tiges quadripolaires (2, 3), un champ de potentiel étant créé à la sortie du piège à ions (4, 5) et diminuant avec l'augmentation du rayon dans une direction radiale. Les ions situés dans le piège à ions (2, 3) sont excités sélectivement par masse dans une direction radiale. Les ions qui ont été excités dans la direction radiale subissent un champ de potentiel qui ne confine plus les ions axialement dans le piège à ions mais qui extrait les ions et, ainsi, provoque l'éjection axiale des ions depuis le piège à ions (2, 3).

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