Faims cell having an offset ion inlet orifice

H - Electricity – 01 – J

Patent

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Details

H01J 49/04 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2634880

A FAIMS cell has an elongated inner electrode with a longitudinal axis extending along a first direction. The inner electrode has a curved outer surface that defines a circle when viewed in a cross section that is taken in a plane normal to the longitudinal axis, which itself passes through the center of the circle so defined. An outer electrode having an inner surface is disposed in a spaced-apart facing relationship relative to the outer surface of the inner electrode so as to define an analytical gap therebetween. A first ion inlet orifice is defined through a first portion of the outer electrode, and an ion outlet orifice is defined through a second portion of the outer electrode. In particular, the first ion inlet orifice has a first ion injection axis that does not pass through the center of the circle. Furthermore, the second electrode does not have defined through any portion thereof an ion inlet orifice having an ion injection axis that passes through the center of the circle.

Une cellule FAIMS comprend une électrode interne allongée avec un axe longitudinal dans un premier sens. Cette électrode interne présente une surface extérieure incurvée qui détermine un cercle, vue dans une coupe prise dans un plan normal à l'axe longitudinal, plan qui passe par le centre du cercle ainsi déterminé. Une électrode extérieure qui présente une surface intérieure est placée pour faire face de manière espacée à la surface extérieure de l'électrode interne, de façon à déterminer un espace d'analyse entre les deux. Un premier orifice d'admission ionique occupe une première partie de l'électrode extérieure, et un orifice de sortie ionique occupe la seconde partie de l'électrode extérieure. En particulier, le premier orifice d'admission ionique présente un premier axe d'injection ionique qui ne passe pas par le centre du cercle. De plus, la seconde électrode ne comporte aucune partie présentant un orifice d'admission ionique avec un axe d'injection ionique passant par le centre du cercle.

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