Vacuum ultraviolet light ionization source device used for mass spectrometry
A vacuum ultraviolet light and mass spectrometry analysis technology, which is applied in the field of vacuum ultraviolet photoionization source devices, can solve the problems of high fragmentation degree, low molecular number density, limited sensitivity and the like
Inactive Publication Date: 2018-05-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
But, this ionization source air pressure is controlled within 50pa, and molecular number density is less, limits the further improvement of sensitivity; Moreover, O 2 + The introduction of reagent ions, compared with single photon ionization, has a higher degree of fragmentation
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[0020] see figure 1 , is a structural representation of the present invention.
[0021] A vacuum ultraviolet photoionization source device for mass spectrometry, comprising a vacuum ultraviolet lamp 1, a sealed ionization source cavity 2, a through hole is opened on the side wall of the ionization source cavity 2, and the through hole passes through a baffle valve 11 and The vacuum pump 10 is connected, and a vacuum gauge 9 is provided on the side wall of the ionization source cavity 2; it is characterized in that:
[0022] The light outlet of the vacuum ultraviolet lamp 1 is placed inside the ionization source cavity 2, and a repelling electrode 5, a transmission electrode 6 and a skimmer electrode 7 are sequentially arranged along the light emitting direction of the vacuum ultraviolet lamp 1;
[0023] The sample molecule injection tube 3 extends into the ionization source cavity 2 through the wall surface of the ionization source cavity 2; the repelling electrode 5 is a fla...
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Abstract
The invention relates to a mass spectrometry apparatus and especially relates to a vacuum ultraviolet light ionization source device used for mass spectrometry. The specific structure comprises a vacuum ultraviolet lamp, an ionization source cavity, a baffle valve, a vacuum gauge and a vacuum pump. An internal portion of the ionization source cavity is provided with a sample molecule sample introduction pipe, a sample ion repulsion electrode, a transmission electrode and a Skimmer electrode along a vacuum ultraviolet lamp emitting direction. All the electrodes are flat plate structures with middle circular holes and are coaxially arranged in a parallel and insulated mode. The ionization source takes low pressure charge transfer reaction as a mechanism, and sample molecules and ultravioletlight generated by the vacuum ultraviolet lamp are subjected to charge transfer reaction to ionize the sample molecules. By using the novel ionization source technology, ionization efficiency for vacuum ultraviolet light to ionize a substance which is difficult to be ionized is greatly increased, and a wide application prospect is possessed in environment monitoring, food safety, medical diagnosisand other fields.
Description
technical field [0001] The invention relates to a mass spectrometry instrument, in particular to a vacuum ultraviolet photoionization source device for mass spectrometry. The ionization source uses a low-pressure charge transfer reaction as the mechanism, specifically, the sample molecules undergo a charge transfer reaction with ultraviolet light irradiated by a vacuum ultraviolet lamp to obtain ionization. The new ionization source technology greatly improves the ionization efficiency of substances that are difficult to ionize by vacuum ultraviolet photoionization. This technology has very broad application prospects in environmental analysis, medical diagnosis and other fields. Background technique [0002] The vacuum ultraviolet lamp ionization source has the advantages of small size, low power consumption, high sensitivity, long life, and simple spectrum. It is suitable for complex sample analysis, online monitoring of samples, process monitoring and other fields. Vacu...
Claims
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Login to View More IPC IPC(8): H01J49/10G01N27/62
CPCH01J49/102G01N27/62
Inventor 李海洋李函蔚侯可勇陈平谢园园王艳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI