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MASS SPECTROMETER

  • US 20110095175A1
  • Filed: 04/20/2005
  • Published: 04/28/2011
  • Est. Priority Date: 04/20/2004
  • Status: Active Grant
First Claim
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1. Apparatus comprising:

  • a first device for separating ions according to their rate of change of ion mobility with electric field strength, said first device comprising a Field Asymmetric Ion Mobility Spectrometry (“

    FAIMS”

    ) device; and

    a second separate device for separating ions according to their ion mobility, said second device comprising an ion mobility separator or ion mobility spectrometer, and said second device being arranged downstream of said first device;

    wherein said second device comprises a plurality of electrodes and wherein, in use, one or more transient DC voltages or one or more transient DC voltage waveforms are progressively applied to said electrodes so that at least some ions having a first ion mobility are separated from other ions having a second different ion mobility.

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