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Ion transmission system

An ion transmission and conical technology, applied in the field of mass spectrometry, can solve problems affecting the sensitivity and detection limit of chemical ionization mass spectrometry, limit the ability of focusing, and ion fragmentation, so as to improve the deposition flux density, prevent ion fragmentation, and improve focus effect of ability

Inactive Publication Date: 2016-09-07
SUN YAT SEN UNIV
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  • Claims
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Problems solved by technology

Compared with the traditional electrostatic ring, the above two ion transmission systems have much superior ion transmission efficiency and focusing ability, and are widely used in current mass spectrometry applications, but the parallel structure of CFIGs limits their focusing ability. The funnel has a more complex structure and is not very convenient to use
[0006] It can be seen that the ion transmission system has a very important impact on the analytical performance of chemical ionization mass spectrometry, especially for the transmission of ion beams. However, the current ion transmission system has problems such as easy ion fragmentation, complex structure, or insufficient focusing ability. Affect the sensitivity and detection limit of chemical ionization mass spectrometry

Method used

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Embodiment 1

[0035] An ion transmission system comprising an octopole device and a power controller;

[0036] Such as figure 1 and 2 As shown, the octopole rod device includes two insulating supports 1 and eight conical rods 2 arranged at equal intervals to form a cone. The two ends of the eight conical rods 2 are fixed by the insulating support 1, and the eight conical rods The ends are respectively used to connect the inlet of the mass spectrometer and the inlet of the mass analyzer;

[0037] Among the eight conical rods, the four conical rods 2 spaced apart form an electrode through wire connection, and the eight conical rods 2 form two electrodes in total, and the two electrodes are respectively applied with the same amplitude value but The RF voltages with opposite phases are simultaneously superimposed axially with DC voltages of the same polarity and value.

[0038] The insulating support 1 needs to be made of an insulating material, and the insulating material is required to hav...

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Abstract

The invention relates to the technical field of mass spectrometry, in particular to an ion transmission system. The ion transmission system comprises an octopole rod device and a power supply controller, wherein the octopole rod device comprises two insulating supports and eight conical rods, wherein the eight conical rods are arranged at equal intervals to form a conical form; two ends of each of the eight conical rods are fixed through the insulating supports and are used for being connected to a mass spectrometer inlet and a mass analyzer inlet respectively; four spaced conical rods are connected through a guide wire to form an electrode; the eight conical rods form two electrodes in all; radio-frequency voltage which is equal in amplitude value, but opposite in phase is applied to the two electrodes through the power supply controller respectively; and meanwhile, DC voltage which is equal in polarity and numerical value is superposed on the two electrodes respectively. The ion transmission system can be applied to a chemical ionization mass spectrometry; ion cleavage caused by a strong electric field can be prevented to the minimum extent; and the focusing capability of ions is effectively improved. The overall system is relatively easy to manufacture and low in cost.

Description

technical field [0001] The present invention relates to the technical field of mass spectrometry, and more specifically, to an ion transmission system. Background technique [0002] Mass spectrometry (Mass Spectrometry) is a technique developed rapidly after the 1950s to analyze the molecular composition of substances. The only ionization method used at first was electron impact ionization. In the late 1960s, chemical ionization gradually developed and became popular, thus forming Chemical ionization mass spectrometry (CIMS) is now widely used in the molecular analysis of inorganic and organic substances. The principle of CIMS is to use ionization methods including radioactive elements, corona discharge, soft X-rays, etc. to generate main ions, through which the main ions and the molecules of the substance to be analyzed undergo ion-molecular reactions, so that they become charged ions, and these ions pass through the ion The transmission system enters the mass analyzer and...

Claims

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Application Information

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IPC IPC(8): H01J49/42
CPCH01J49/4225
Inventor 赵军
Owner SUN YAT SEN UNIV
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