A method of operating a mass spectrometer to suppress...

Details A method of operating a mass spectrometer to suppress... A method of operating a mass spectrometer to suppress...

H - Electricity

01

J

H01J 49/42 (2006.01)

Patent

CA 2447035

In a mass spectrometry system, a method of operating a processing section, for example a collision cell, is provided. The method is based on the realization that some interfering ions after collision will have significantly lower kinetic energy than desired analyte ions. These interfering ions can be ions originating from the source, or product ions formed by reaction with gas particles, or ions produced by other processes within the cell. Significantly, these interfering ions can have lower kinetic energies, as compared to desired analyte ions, but this energy differential disappears, or is much reduced, at the exit of the collision cell, rendering post-cell energy discrimination less effective. The invention provides a field within the cell to discriminate against the interfering ions based on their lower kinetic energy.

L'invention concerne un procédé d'exploitation d'une section de traitement, par exemple une cellule de collision, d'un système de spectrométrie de masse. Ledit procédé se base sur le fait que certains ions brouilleurs présentent une énergie cinétique bien inférieure à celle des ions que l'on souhaite analyser. Ces ions brouilleurs peuvent être des ions générés à la source, ou des ions formés par réaction avec des particules gazeuses, ou des ions obtenus par d'autres processus dans la cellule. Ces ions brouilleurs peuvent présenter des énergies cinétiques inférieures, comparées à celles des ions que l'on souhaite analyser, mais cette différence d'énergie disparaît ou est réduite à la sortie de la cellule de collision, rendant la discrimination d'énergie post-cellule moins efficace. L'invention concerne également un champ de la cellule servant à la discrimination des ions brouilleurs en fonction de leur énergie cinétique inférieure.

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