Reagent ion assisted photoinduced chemical ionization source
A chemical ionization source and ion-assisted technology, applied in electron/ion optical devices, ion sources/guns, circuits, etc., can solve the problems of reduced ionization efficiency
Inactive Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
However, the ionization efficiency of the VUV lamp is related to the ionization energy and ionization cross section of the substance. For compounds with ionization energy higher than 10.0ev and smaller ionization cross section, the ionization efficiency will be greatly reduced
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[0023] See figure 1 , Is a schematic diagram of the structure of the present invention.
[0024] A photochemical ionization source assisted by reagent ions, comprising a VUV lamp 1, a closed ionization source cavity 2, and a through hole is opened on the side wall of the ionization source cavity 2, and the through hole is connected to a vacuum pump 9 through a baffle valve 8 , On the side wall of the ionization source cavity 2 is provided with a vacuum gauge 10 for measuring the vacuum degree in the cavity; the lower part of the ionization source cavity 2 is airtightly connected with a Skimmer electrode 6, and the lower wall of the ionization source cavity 2 is provided with a Skimmer electrode 6 The through hole corresponding to the middle through hole serves as the ion outlet 7, and the ions are ejected through the middle through hole of the Skimmer electrode 6 after passing through the ion outlet 7, and are characterized in that:
[0025] The VUV lamp 1 is located on the upper ...
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Abstract
The invention relates to a reagent ion assisted photoinduced chemical ionization source. The source comprises a VUV lamp, an ionization source cavity, a baffle valve, a vacuum gauge and a vacuum pump.According to the reagent ion assisted photoinduced chemical ionization source, low-pressure sample molecules and chemical reagent ions are subjected to a chemical reaction as a mechanism, specifically, vacuum ultraviolet light generated by the VUV lamp cooperates with the reagent ions and the sample molecules to be subjected to a photoinduced chemical reaction, and then the sample molecules are ionized. According to the novel reagent ion assisted photoinduced chemical ionization source technology, the ionization efficiency of the VUV lamp for continuous online ionization of substances difficult to ionize is greatly improved; and meanwhile, reagent ions and sample molecules are subjected to a chemical reaction, so that the sample molecules are more fully dissociated, the accuracy of the detection result of the sample molecules is qualitatively improved, and the reagent ion assisted photoinduced chemical ionization source has a wide application prospect in the fields of environmental monitoring, food safety, medical diagnosis and the like.
Description
Technical field [0001] The invention relates to a mass spectrometer analysis instrument, in particular to a photochemical ionization source assisted by reagent ions. The reagent ion-assisted photochemical ionization source uses a low-pressure sample molecule to chemically react with chemical reagent ions as a mechanism. Specifically, the vacuum ultraviolet light generated by the VUV lamp cooperates with the reagent ion to undergo a photochemical reaction with the sample molecule, and then The sample molecules are ionized. The new reagent ion-assisted photochemical ionization source technology greatly improves the ionization efficiency of the VUV lamp for continuous online ionization of difficult-to-ionize substances. At the same time, the chemical reaction between the reagent ions and the sample molecules makes the sample molecules more fully dissociated, and the sample molecules are detected. The accuracy of the results has been qualitatively improved, and it has broad applica...
Claims
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Login to View More IPC IPC(8): H01J49/06H01J49/16
CPCH01J49/06H01J49/161
Inventor 李海洋李函蔚侯可勇蒋吉春万宁波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI