Mass spectrometer

Details Mass spectrometer Mass spectrometer

2011-04-05

2011-04-05

Vanore, David A (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S281000, C250S291000, C250S292000, C702S030000, C702S181000

Reexamination Certificate

active

07919747

ABSTRACT:
An ion guide or mass analyser (2) is disclosed comprising a plurality of electrodes (2a) having apertures through which ions are transmitted in use. A pseudo-potential barrier is created at the exit of the ion guide or mass analyser (2). The amplitude or depth of the pseudo-potential barrier is inversely proportional to the mass to charge ratio of an ion. One or more transient DC voltages (4) are applied to the electrodes (2a) of the ion guide or mass analyser (2) in order to urge ions along the length of the ion guides or mass analyser (2). The amplitude of the transient DC voltage (4) applied to the electrode (2a) may be increased with time so that ions are caused to be emitted from the ion guide or mass analyser (2) in reverse order of their mass to charge ratio.

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