Electron transport method and device for internal ion source mass spectrometer
A source mass spectrometer and electron transmission technology, which is applied in the field of electron transmission in mass spectrometers, can solve problems such as mass spectrometer noise and spectrum matching effects, and achieve the effects of reducing chemical noise and interference, improving matching levels, and overcoming leakage
Active Publication Date: 2015-09-30
FOCUSED PHOTONICS +1
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Problems solved by technology
In severe cases, it will have a great impact on the noise and spectrum matching of mass spectrometers
Method used
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[0038] figure 2 A basic structure diagram of an electron transport device for an internal ion source mass spectrometer according to an embodiment of the present invention is schematically given. Such as figure 2 As shown, the electronic transmission device includes:
[0039] As the electron source, a filament can be used as the electron source. Of course, other electron sources can also be used, which are all prior art in this field, and will not be repeated here.
[0040] The electrodes a and b are arranged in sequence in the axial direction, and the axes are on the same straight line. The electrodes are arranged on one side of the electron source and are isolated from each other. The above-mentioned electrodes are provided with through holes for the passage of electrons, and the directions of the through holes are the same. The hole is in any shape, such as a triangular prism, a quadrangular prism, a cylinder, and the like. Such as image 3 As shown, the through hole...
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The invention relates to an electronic transmission method of an internal ion-source mass spectrometer, wherein the method comprises the following steps: sequentially arranging an electrode a and an electrode b on one side of an electron source, wherein through holes through which electron currents generated by the electron source can pass conveniently are arranged on the electrode a and the electrode b, and the electrodes are mutually isolated; respectively supplying power to the electron source, the electrode a and the electrode b through a power supply; at an analysis stage, applying square-wave voltage signals to the electrode a through the power supply, wherein the high potential V1 is greater than or equal to 50V and is less than or equal to 250V, and the low potential V3 is greater than or equal to minus 250V and is less than or equal to minus 50V; and applying square-wave voltage signals to the electrode b through the power supply, wherein the high potential V2 is greater than 20V, and the low potential V4 is greater than or equal to minus 10V and is less than or equal to 10V. The invention also relates to an electronic transmission device for the internal ion-source mass spectrometer. The device provided by the invention has the advantages that the noise baseline is small, a multiplier tube can be calibrated, and the like.
Description
technical field [0001] The invention relates to electron transmission in a mass spectrometer, in particular to an electron transmission method and device for an internal ion source mass spectrometer. Background technique [0002] Mass spectrometry is mainly a method for qualitative and quantitative analysis of samples by analyzing the mass-to-charge ratio of sample ions. The basic components of a mass spectrometer include an ion source, a mass analyzer, a detector, and a vacuum system. The role of the ion source is to ionize the sample to be analyzed to obtain ions with sample information. [0003] According to the space where the ionization process is located, ion sources can be divided into internal ion sources and external ion sources. Among them, the ionization process completed in the mass analyzer is called the internal ion source, and the electrons enter the mass analyzer through a transmission device. The transmission device is used to realize the electrons enterin...
Claims
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IPC IPC(8): H01J49/06
Inventor 俞建成邓丰涛闻路红刘立鹏李晓旭吴先伟
Owner FOCUSED PHOTONICS