Multi-channel mixing ionization source and working method thereof

Abstract

The invention provides a multi-channel ionization source. The ionization source comprises an ion transmission channel and at least two ion channels, wherein the transmission channel comprises a first repulsion electrode and an ion lens, each of the ion channels comprises a repulsion electrode, an ionization source, a transmission electrode and a switching electrode, the included angle formed by at least two ion channels and the ion transmission channel is in a range from 0 degree to 180 degrees, and ions generated by any ionization source enter the ion lens through the transmission electrodes and the switching electrodes under the action of the transmission electrodes, the first repulsion electrode and the repulsion electrodes of the ion channels. The switching is automatic, and a plurality of objects are detected at the same.

Description

technical field [0001] The invention relates to an ionization source, in particular to a multi-channel ionization source and its working method. Background technique [0002] Gas chromatography-mass spectrometry instrument is one of the important members in the field of analytical instruments. The mixed organic molecules enter the mass spectrometer after being separated by the gas chromatography column. The mass spectrometer ionizes the organic molecules and makes various ions under the action of electric field or magnetic field. Separation is carried out according to the mass-to-charge ratio, and the corresponding intensity is detected. The obtained mass spectrum signal can be used for qualitative identification and quantitative analysis of substances. [0003] The mass spectrometer detector used to connect with the gas chromatograph usually has two kinds of ion sources, electron ionization (EI) source and chemical ionization (CI). There are certain differences in the struc...

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Problems solved by technology

In more application fields, to analyze different substances, different gas chromatographic columns need to be used, and the chromatographic and mass spectrometer instruments need to be switched off to replace the chromatographic column. This replacement process is often complicated, and the detection performance after restarting is often not highly reliable consistency

[0004] In many analysis and detection fields, the above-mentioned mass spectrometry problems will be encountered. For example, the detection of strong polar and weak polar organic substances requires replacement of the chromatographic column. In order to obtain the molecular ion information of the substance, the ion source needs to be replaced. In some GC-MS instruments, Realized double-column sampling, that is, installed two chromatographic columns in the same set of column thermostat system, and inserted the two chromatographic columns into one ion source at the same time. Simultaneous analysis of two classes of substances

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