Mass spectrometer

H - Electricity – 01 – J

Patent

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H01J 49/42 (2006.01)

Patent

CA 2626209

A mass analyser (2) is provided comprising a plurality of electrodes having apertures through which ions are transmitted in use. A plurality of pseudo- potential corrugations are created along the axis of the mass analyser (2). The amplitude or depth of the pseudo-potential corrugations is inversely proportional to the mass to charge ratio of an ion. One or more transient DC voltages are applied to the electrodes of the mass analyser (2) in order to urge ions along the length of the mass analyser (2). The amplitude of the transient DC voltages applied to the electrodes is increased with time and ions are caused to be emitted from the mass analyser (2) in reverse order of mass to charge ratio.

L'invention concerne un analyseur de masse (2) qui comprend plusieurs électrodes présentant des ouvertures à travers lesquelles des ions sont transmis en utilisation. Plusieurs ondulations pseudo-potentielles sont créées le long de l'axe de l'analyseur de masse (2). L'amplitude ou la profondeur de ces ondulations pseudo-potentielles est inversement proportionnelle au rapport masse-charge d'un ion. Une ou plusieurs tensions CC transitoires sont appliquées aux électrodes de l'analyseur de masse (2) afin d'exciter les ions le long de cet analyseur de masse (2). L'amplitude des tensions CC transitoires appliquées aux électrodes est augmentée en fonction du temps, ce qui provoque l'émission des ions à partir de l'analyseur de masse (2) en ordre inverse du rapport masse-charge.

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