Neutral/ion reactor in adiabatic supersonic gas flow for ion mobility time-of-flight mass spectrometry

An apparatus for the analysis of gaseous ions and neutral species and mixtures thereof, said apparatus comprising:

• an ion source for the production of gaseous ions and neutral species and mixtures thereof;
• a gas flow formation region fluidly coupled to said ion source, said gas flow formation region comprising a sectioned capillary having at least two electrodes, said gas flow formation region operable to accept ions and/or neutral species from said ion source;
• at least one sectioned radio-frequency multipole ion guide fluidly coupled to said gas flow formation region, said sectioned ion guide comprising a plurality of electrically isolated electrode sections;
• an exit orifice fluidly coupled to said at least one sectioned radio-frequency multipole ion guide;
• and,
• a detector fluidly coupled to said exit orifice.