Multipole mass filter with artifact-reducing electrode structure专利检索-直流分量电路专利检索查询-专利查询网

Multipole mass filter with artifact-reducing electrode structure

阅读：831发布：2023-07-18

专利汇可以提供Multipole mass filter with artifact-reducing electrode structure专利检索，专利查询，专利分析的服务。并且Parallel primary electrodes are symmetrically disposed about a central axis within an electrically conductive housing operated at a reference potential. These primary electrodes are driven by an excitation voltage comprising A.C. and D.C. components balanced with respect to the reference potential to provide a multipole mass filter. An ion source is positioned adjacent to the entrance end of the multipole mass filter for transmitting ions generally along the central axis to an ion detector positioned adjacent to the exit end of the multipole mass filter. Auxiliary electrodes, at least some of which may be operated at different potentials, are disposed between adjacent pairs of the primary electrodes along the length thereof outside the central region defined by a cylinder inscribed between the primary electrodes. These auxiliary electrodes are driven by a plurality of independently adjustable D.C. control voltages to reduce artifacts in the mass spectra obtained from the multipole mass filter.，下面是Multipole mass filter with artifact-reducing electrode structure专利的具体信息内容。

权利要求

1. A multipole mass filter comprising: a plurality of substantially parallel primary electrodes for separating charged particles on the bases of their mass to charge ratio, said primary electrodes being spaced symmetrically about a central axis for receiving an excitation voltage including A.C. and D.C. components balanced with respect to a reference potential to produce alternating and static multipole electric field components in the central region between the primary electrodes; and a plurality of auxiliary electrodes for altering the multipole electric field components in the central region between the primary electrodes to reduce artifacts in a mass spectrum obtained from the mass filter, at least two of said auxiliary electrodes being independently operable at different potentials and at least one of said auxiliary electrodes being positioned between each adjacent pair of the primary electrodes along the length thereof outside the central region between the primary electrodes.

2. A multipole mass filter as in claim 1 wherein at least one auxiliary electrode positioned between each adjacent pair of the primary electrodes may be operated at a different potential from at least one auxiliary electrode positioned between each of the other adjacent pairs of the primary electrodes.

3. A multipole mass filter as in claim 2 wherein said auxiliary electrodes are symmetrically positioned about the central axis along the full length of the primary electrodes.

4. A multipole mass filter as in claim 3 wherein said auxiliary electrodes comprise a single auxiliary electrode positioned between each of the adjacent pairs of the primary electrodes.

5. A multipole mass filter as in claim 4 wherein each of said auxiliary electrodes comprises an electrically conductive rod or tube.

6. A multipole mass filter as in claim 3 wherein said auxiliary electrodes comprise a pair of auxiliary electrodes positioned between each of the adjacent pairs of the primary electrodes.

7. A multipolE mass filter as in claim 6 wherein each of said pairs of auxiliary electrodes comprises a pair of electrically conductive rods or tubes that may be operated at different potentials.

8. A multipole mass filter as in claim 7 wherein the electrically conductive rods or tubes of each of said pairs of auxiliary electrodes are positioned side by side.

9. A multipole mass filter as in claim 7 wherein the electrically conductive rods or tubes of each of said pairs of auxiliary electrodes are positioned one outside the other.

10. A multipole mass filter as in claim 6 wherein each of said pairs of auxiliary electrodes comprises a pair of electrically conductive combs that may be operated at different potentials.

11. A multipole mass filter as in claim 6 wherein each of said pairs of auxiliary electrodes comprises a pair of electrically conductive bifilar helices that may be operated at different potentials.

12. A quadrupole mass filter as in claim 3 wherein: said primary electrodes comprise four substantially parallel, coextensive, electrically-conductive cylindrical rods; said auxiliary electrodes comprise electrically conductive members supported from the ends of the primary electrodes; an ion source is positioned adjacent to one end of the central region between the primary electrodes for focusing ions along the central axis; and an ion detector is positioned adjacent to the other end of the central region between the primary electrodes for detecting ions passing therethrough.

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Multipole mass filter with artifact-reducing electrode structure

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