Closed loop ion guide with pseudo-potential well

摘要

A closed-loop ion guide is disclosed comprising a plurality of electrodes having apertures through which ions are transmitted in use. Ions are injected into the closed-loop ion guide and may make several circuits of the closed-loop ion guide before being ejected from the ion guide. In a mode of operation the ion guide may be arranged to separate ions temporally according to their ion mobility.

主权项

1. A mass spectrometer comprising a closed-loop ion guide comprising:
a plurality of electrodes, an AC or RF voltage supply for applying an AC or RF voltage to the plurality of electrodes, said AC or RF voltage generating a pseudo-potential well which acts to confine ions radially within said closed-loop ion guide, and a DC voltage supply for progressively applying one more transient DC voltages or potentials or DC voltage or potential waveforms to at least some of the electrodes of the ion guide so as to drive or urge ions along or around at least some of the length or ion guiding path of said ion guide.