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Composite ionization source for vacuum ultraviolet light ionization and chemical ionization

A technology of vacuum ultraviolet light source and vacuum ultraviolet light, which is applied to the parts of ion source/gun, particle separator tube, etc., can solve the problems of limited chemical ionization sensitivity, unfavorable reagent ion strength, short residence time, etc. Detection Sensitivity, Increased Residence Time, Wider Range Effects

Active Publication Date: 2016-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the photoelectrons move in a straight line in the electrostatic field, the moving speed is fast, and the residence time in the ionization area is short, which is not conducive to the improvement of the ion strength of the reagent, which limits the sensitivity of chemical ionization

Method used

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  • Composite ionization source for vacuum ultraviolet light ionization and chemical ionization

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Embodiment Construction

[0024] Such as figure 1 As shown, a vacuum ultraviolet photoionization and chemical ionization composite ionization source based on ion funnel radio frequency electric field enhancement, including a vacuum ultraviolet light source 1, an ionization chamber cavity 2, two or more transmission electrodes 4, and a metal grid 5 And the ion funnel 6 is provided with a sample gas capillary 3 interface, a reagent gas capillary 10 interface, a vacuum gauge 7 interface and a mechanical vacuum pump 8 exhaust ports on the ionization chamber cavity 2 walls.

[0025] The transmission electrode 4 is placed inside the ionization chamber cavity 2 and consists of four electrodes with a spacing of 3 mm. The transmission electrodes 4 have through holes in the axial direction. The transmission electrodes 4 are arranged parallel to each other at intervals, and the through holes are coaxial.

[0026] An ultraviolet light inlet is provided on the wall of the ionization chamber cavity 2 above the throu...

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Abstract

The invention relates to a mass spectrometry device and particularly relates to a composite ionization source for vacuum ultraviolet (uv) light ionization and chemical ionization on the basis of increase of an ion tunnel radio frequency electric field. The composite ionization source comprises a vacuum uv light source and an ionization room chamber, multiple transmission electrodes and ion funnels are coaxially arranged with intervals in an ionization room, the transmission electrode far from an uv light inlet is pasted with a metal grid mesh, uv light emitted by the vacuum uv light source irradiates on the metal grid mesh to generate photoelectrons, and a radio frequency voltage is exerted on the ion funnel. The composite ionization source is on the basis of vacuum uv light ionization, a photoelectron ionization reagent gas is utilized, a sample is facilitated by reagent ions to generate chemical ionization, efficiency of chemical ionization triggered by the photoelectrons can be improved through the ion funnel radio frequency electric field, in combination with the ion focusing function of the ion funnel, detection sensitivity is improved, moreover, compounds of which ionization energy is greater than vacuum uv light photon energy can be ionized through chemical ionization, and the ionizable compound scope is expanded.

Description

technical field [0001] The invention relates to a mass spectrometry instrument, in particular to a vacuum ultraviolet photoionization and chemical ionization compound ionization source based on ion funnel radio frequency electric field enhancement. On the basis of vacuum ultraviolet photoionization, the present invention uses the photoelectron ionization reagent gas generated by the photoelectric effect, and the reagent ions further cause chemical ionization of the sample molecules; the ionization efficiency of the chemical ionization caused by photoelectrons can be improved through the ion funnel radio frequency electric field, and the combined ions The ion focusing function of the funnel can improve the detection sensitivity; in addition, through chemical ionization, the soft ionization of sample molecules whose ionization energy is higher than the energy of vacuum ultraviolet photons can be realized, and the range of ionizable compounds can be broadened. Background techniq...

Claims

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Application Information

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IPC IPC(8): H01J49/16
Inventor 李海洋陈文东侯可勇李金旭李庆运王爽
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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