Methods for cooling ions in a linear ion trap

H - Electricity – 01 – J

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H01J 49/10 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2711600

Methods for cooling ions retained in an ion trap are described. In various embodiments, a cooling gas is delivered into a linear ion trap causing a non-steady state pressure elevation in at least a portion of the trap above about 8 x 10-5 Torr for a duration less than the ion-retention time. In various embodiments, the duration of pressure elevation can be based upon a period of time required for an ion to lose a desired amount of its kinetic energy.

L'invention porte sur des procédés pour refroidir des ions retenus dans un piège à ions. Dans divers modes de réalisation, un gaz refroidissant est distribué dans un piège à ions linéaire provoquant une élévation de pression d'état non stable dans au moins une partie du piège au-dessus d'environ 8 x 10-5 Torr pendant une durée inférieure au temps de rétention d'ions. Dans divers modes de réalisation, la durée d'élévation de pression peut être basée sur une période de temps requise pour qu'un ion perde une quantité désirée de son énergie cinétique.

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