Improved axial ejection resolution in multipole mass...

H - Electricity – 01 – J

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H01J 49/42 (2006.01)

Patent

CA 2483542

An improved method of operating a mass spectrometer having a linear ion trap wherein ions are axially ejected from the trap to a detector or subsequent mass analysis stage. The DC barrier field produced at the exit lens of the trap is scanned in conjunction with the scanning of other fields used to energize ions of select mass-to-charge ratios past the barrier field/exit lens. The technique can maximize the resolution obtainable from axial ejection over a wide mass range.

Un procédé amélioré pour faire fonctionner un spectromètre de masse comportant un piège à ions linéaire dans lequel les ions sont éjectés axialement depuis le piège en direction du détecteur ou de l'étage d'analyse de masse suivant. Le champ barrière à courant continu généré à la lentille de sortie du piège est balayé, en conjonction avec le balayage d'autres champs utilisés pour charger les ions à rapports masse / charge sélectionnés, au delà de la lentille de champ barrière / de sortie. Cette technique permet de porter au maximum la résolution qui peut être obtenue grâce à l'éjection axiale, et ce sur une vaste gamme de masses.

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