Method and apparatus for multiple frequency multipole
AssigneeBruker Daltonics, Inc.
InventorMelvin A. Park
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Abstract
The invention relates to a means and a method for the manipulation of ions. Specifically, the invention teaches a multipole device consisting of a multitude of electrodes which are of such a geometry that the proper application of RF and DC potentials between the electrodes will result in the transmission of a broad range of m/z ions through the device. The electrodes may be arranged in such a way that it also can be operated so as to select a narrow range of m/z ions for transmission through the device.
Claims18
A method of using a mass analyzer comprising at least one multiple frequency multipole device for guiding, trapping, or selecting ions, wherein said multipole device comprises a plurality of electrodes configured such that a plurality of electric fields are induced creating a plurality of virtual and actual poles, said method comprising the steps of:
- applying an RF potential of a predetermined amplitude and frequency to said electrodes between adjacent ones of said virtual poles;
- applying a predetermined DC potential to said electrodes between adjacent ones of said virtual poles;
- and
- injecting ions into said multipole device from an ion source;
- wherein the amplitudes of said RF potential and said DC potential and the frequency of said RF potential are chosen so that ions of a selected m/z range pass through said multipole device.
A method for controlling the potentials applied to a multiple frequency multipole device in a mass spectrometer, said method comprising the steps of:
- coupling a first oscillator to a first transformer;
- and
- coupling a second oscillator to a second transformer;
- wherein said first transformer comprises a primary coil and at least one secondary coil having leads and center taps;
- wherein said second transformer comprises a primary coil and at least one secondary coil having leads and center taps;
- wherein said leads of said secondary coil of said first transformer are connected to said center taps of the secondary coil of said second transformer;
- and
- wherein said leads of said secondary coil of said second transformer are connected to the electrodes of the multiple frequency multipole device configured such that ions near the boundaries within said multipole device experience a first electric field and said ions away from the boundaries within said multipole device experience a second electric field.
Dependencies are inferred from the claim text.