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AssigneeBruker-Franzen Analytik GmbH
InventorsJochen Franzen, Reemt-Holger Gabling, Yang Wang
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The invention relates to methods and devices for the effective introduction of ions, which are stored in an RF ion guide into a quadrupole ion trap. The invention consists of arranging a switchable ion lens between the RF ion guide and the quadrupole ion trap, and introducing the ions into the quadrupole ion trap by a suitable connection of the ion lens only during the filling period, while otherwise the ions are reflected back into the RF ion guide. The filling period can be divided up and limited to the capture intervals of the quadrupole ion trap during each RF period. Measurement of the filling rate can be made by switching open the ion lens longer then the admission interval of the quadrupole ion trap, and measuring the flow of the ions passing through on the detector.
Method for the transfer of ions from a storage RF ion guide into a quadrupole ion trap, which is operated by an RF driving voltage, wherein a switchable ion lens is arranged between RF ion guide and quadrupole ion trap, consisting of a first aperture diaphragm at the end of the RF ion guide, a second aperture diaphragm, and an aperture in the injection end cap of the quadrupole ion trap, and wherein the lens can be switched to ion passage for filling of the quadrupole trap and otherwise to ion reflection.
Device consisting of a quadrupole ion trap with voltage supply, an RF ion guide with voltage supply, and a switchable ion lens made up of three coaxial aperture diaphragms with voltage supply, wherein the ion lens is arranged at the end of RF ion guide and the injection end cap forms the third aperture diaphragm of the lens.
Dependencies are inferred from the claim text.