Quadrupole-rod electrode system
An electrode system and quadrupole technology, applied in dynamic spectrometers, track-stabilized spectrometers, mass spectrometers, etc., can solve problems such as performance changes, and achieve the effects of simple structure, unique performance, and low cost
Inactive Publication Date: 2013-06-12
FUDAN UNIV
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[0008] Traditional symmetric quadrupole electrode systems generally have better mass resolution capabilities, while asymmetric quadrupole electrode systems, due to the introduction of high-order field components in their electric field distribution, will lead to changes in their performance
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[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0032] 2 is a schematic cross-sectional view of the quadrupole electrode system used in the present invention, 201, 202, 203 and 204 are four cylindrical electrode rods, r1, r2, r3, r4 respectively represent the radius of the four cylindrical electrodes. The electrodes 201 , 202 , 203 , 204 are circumscribed to a circle 205 with a radius R. 206 and 207 are two mutually perpendicular centerlines of the inscribed circle 205 . The centers of the two electrode rods 201 and 203 in the X direction all fall on the center line 206, the centers of the electrode rods 202 in the Y direction fall on the center line 207, and the centers of the electrode rods 203 fall on the center line 207θ angle away from the center line. direction. The radii of the four cylindrical electrodes and the radii of the inscribed circle conform to the relationship of r1=r2=r3...
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The invention belongs to the technical field of quality analysis instruments and particularly relates to a quadrupole-rod electrode system. The quadrupole-rod electrode system consists of four cylindrical electrodes, wherein each of three electrodes has a diameter d, the other electrode has a diameter D, and D is more than d; and the four electrodes are arranged in parallel and are externally tangent to a circle which has a diameter of d0, wherein d0 is equal to d. The two electrodes with the diameter d are distributed in an x-axis direction, another electrode with the diameter d is distributed in a y-axis shaft, and the electrode with the diameter D deviates from a theta-angle direction of a y-axis. The quadrupole-rod system disclosed by the invention is simple in structure, uniform in performance and low in cost; the internal high-order field components can be effectively improved by adjusting the electric field distribution of the quadrupole-rod electrode system, different high-order field ingredients are mutually matched, so that the ion transmission efficiency of the quadrupole-rod system can be effectively improved, and furthermore the purpose of improving the ion collision and dissociation efficiency in a cascaded mass spectrum is achieved.
Description
technical field [0001] The invention belongs to the technical field of mass analysis instruments, and in particular relates to a quadrupole electrode system. 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] Figure 1 shows a schematic diagram of a quadrupole ion mass analyzer composed of four cylindrical electrodes. Four cylindrical electrodes 101, 102, 103 and 104 are fixed together in a certain way to form a quadrupole electrode system. Then two opposite electrodes, electrodes 101 and 103, and electrodes 102 and 104 are connected together to form...
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IPC IPC(8): H01J49/42
Inventor 王岳东肖育陈末华丁传凡
Owner FUDAN UNIV