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George C Stafford, Paul E Kelley, David R Stephens: Method of mass analyzing a sample by use of a quadrupole ion trap. Finnigan Corporation, Flehr Hohbach Test Albritton & Herbert, September 10, 1985: US04540884 (164 worldwide citation)

In a quadrupole ion store or ion trap type mass spectometer, significantly improved mass selection is achieved by simultaneously trapping ions within the mass range of interest and then scanning the applied RF and DC voltages or the frequency .omega. to sequentially render unstable trapped ions of c ...


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Stafford George C, Kelley Paul E, Stephens David R: Methode danalyse de masse dun echantillon par intervention dun piege dions tetrapolaire, Method of mass analyzing a sample by use of a quadrupole ion trap. Finnigan Corporation, SMART & BIGGAR, July 15, 1986: CA1207918

ABSTRACT OF THE DISCLOSURE: In a quadrupole ion store or ion trap type mass spectrometer, significantly improved mass selection is achieved by scanning the applied RF and DC voltages or the frequency .omega. sequentially to render unstable trapped ions. These are passed out through apertures in an e ...