Method for axial ejection and in-trap fragmentation using...

H - Electricity – 01 – J

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H01J 49/10 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2660335

A method of operating a mass spectrometer having an elongated rod set and a set of auxiliary electrodes is provided, the rod set having an entrance end and an exit end and a longitudinal axis. The method comprises a) admitting ions into the entrance end of the rod set; b) trapping at least some of the ions in the rod set by producing a barrier field at an exit member adjacent to the exit end of the rod set and by producing an RF field between the rods of the rod set; and, c) providing an auxiliary AC excitement voltage to the set of auxiliary electrodes to energize a first group of ions of a selected mass to charge.

L'invention concerne un procédé consistant à faire fonctionner un spectromètre de masse ayant un ensemble de tiges allongé et un ensemble d'électrodes auxiliaires, l'ensemble de tiges ayant une extrémité d'entrée et une extrémité de sortie et un axe longitudinal. Le procédé comporte les opérations consistant à a) admettre des ions à l'intérieur de l'extrémité d'entrée de l'ensemble de tiges; b) piéger au moins certains des ions dans l'ensemble de tiges par production d'un champ barrière au niveau d'un élément de sortie adjacent à l'extrémité de sortie de l'ensemble de tiges et par production d'un champ RF entre les tiges de l'ensemble de tiges; et, c) fournir une tension d'excitation auxiliaire en courant alternatif à l'ensemble d'électrodes auxiliaires pour exciter un premier groupe d'ions d'une masse sélectionnée à charger.

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