Quadrupole rod electrode system for generating high order field component

Abstract

The invention belongs to the technical field of quality analysis instruments and particularly relates to a quadrupole rod electrode system for generating a high order field component. The system is composed of four cylindrical electrodes, the diameter of three electrodes is d, the diameter of the other electrode is D, and D>d. Circle centers of the four cylindrical electrodes are located on two perpendicular straight lines with two on each line, a space is defined by the four electrodes which are parallel, the middles of the surfaces of the four electrodes form an incircle with the diameter as d0, and the diameter of the incircle satisfies the condition that d0=d. The experiment system has the advantages of being simple in structure, unique in performance, cheap in construction cost and the like, is capable of adjusting electric field distribution and achieves the aim of improving ion transmission efficiency, ion storage capability and cascade stage quality analysis efficiency.

Description

technical field [0001] The invention belongs to the field of mass spectrometer and analysis technology, in particular to a quadrupole electrode system for generating high-order field components. Background technique [0002] A mass spectrometer is a scientific instrument used to analyze various chemical components, contents and molecular structures in a substance sample. Quadrupole mass spectrometer is one of the mass spectrometers widely used at present. It has the characteristics of simple structure, convenient operation, and relatively cheap price, and is widely used in various fields such as scientific research, medical hygiene, and environmental science. [0003] It is generally believed that a quadrupole rod electrode system consisting of four hyperbolic electrodes produces a quadrupole mass analyzer with ideal quadrupole field distribution. In practical applications, cylindrical electrodes are often used instead of hyperbolic electrodes to produce a quadrupole elect...

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Problems solved by technology

[0008] Due to the quadrupole system constructed by the hyperbolic electrode and the cylindrical electrode fixed in a specific way can produce a near-perfect quadrupole electric field composition, and the geometric deviation produced by the electrode rod processing and the assembly of the quadrupole electrode rod system will lead to The generation of high-order field components and the decline in the mass resolution of quadrupole mass spectrometry are believed to be the root cause of the deterioration of quadrupole mass spectrometry performance.

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