Patent ID: 8410437

Claim:
An Electron Transfer Dissociation or Proton Transfer Reaction device comprising: an ion guide comprising a plurality of electrodes each having at least one aperture, wherein ions are transmitted in use through said apertures; a first device arranged and adapted to apply one or more first transient DC voltages or potentials or one or more first transient DC voltage or potential waveforms to at least some of said plurality of electrodes in order to drive or urge at least some first ions along or through at least a portion of the axial length of said ion guide in a first direction; and a second device arranged and adapted to apply one or more second transient DC voltages or potentials or one or more second transient DC voltage or potential waveforms to at least some of said plurality of electrodes in order to drive or urge at least some second ions along or through at least a portion of the axial length of said ion guide in a second different direction.