Patent ID: 7547878

Claim:
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, wherein said multipole ion guide produces a resonant rotating field which extracts specific ions from said gas flow and causes said specific ions to follow a rotational orbit around the central axis of said multipole ion guide; and, a detector fluidly coupled to said exit orifice.