Vacuum ultraviolet photoionization and chemical ionization compound ionization source based on radio frequency electric field enhancement of quadrupole rod
A technology of vacuum ultraviolet light and chemical ionization, applied in the direction of ion source/gun, circuit, discharge tube, etc., can solve the problems of short residence time, fast movement speed, limited sensitivity of chemical ionization, etc., to improve ionization efficiency and detection Sensitivity and residence time improvement effects
Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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
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[0026] Such as figure 1 As shown, a vacuum ultraviolet photoionization and chemical ionization composite ionization source based on quadrupole 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. The quadrupole rod 6 and the vacuum differential hole electrode 7 are provided with a sample gas capillary 3 interface, a reagent gas capillary 11 interface, a vacuum gauge 8 interface and a mechanical vacuum pump 9 exhaust port on the wall of the ionization chamber cavity.
[0027] 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.
[0028] An ultraviolet light inlet is provided on the wall ...
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The invention relates to a mass spectrum analysis instrument, in particular to a vacuum ultraviolet photoionization and chemical ionization compound ionization source based on radio frequency electric field enhancement of quadrupole rods. The vacuum ultraviolet photoionization and chemical ionization compound ionization source based on radio frequency electric field enhancement of the quadrupole rod comprises a vacuum ultraviolet light source and an ionization chamber cavity; a plurality of transmission electrodes, the quadrupole rods and vacuum differential hole electrodes are coaxially arranged in an ionization chamber in a spaced mode; a metal grid mesh is attached to the transmission electrode far away from an ultraviolet light inlet, ultraviolet light emitted by the vacuum ultraviolet light source is irradiated to the metal grid mesh and phoelectrons are generated; direct-current voltage and radio frequency voltage are applied to the quadrupole rods. On the basis of vacuum ultraviolet photoionization, the compound ionization source ionizes reagent gas through the phoelectrons generated through the photoelectric effect, and therefore chemical ionization happens to samples through reagent ions; through the radio frequency electric field of the quadrupole rods, ionization efficiency of chemical ionization caused by the phoelectrons can be improved; besides, chemical compounds with ionization higher than vacuum ultraviolet light photon energy can be ionized through chemical ionization, and the range of the chemical compounds capable of being ionized is widened.
Description
technical field [0001] The invention relates to a mass spectrometer analysis instrument, in particular to a vacuum ultraviolet photoionization and chemical ionization compound ionization source based on quadrupole 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 sample molecules; the ionization efficiency of chemical ionization caused by photoelectrons is improved through the quadrupole radio frequency electric field, which can improve detection Sensitivity; In addition, chemical ionization can achieve soft ionization of sample molecules whose ionization energy is higher than that of vacuum ultraviolet photons, broadening the range of ionizable compounds. Background technique [0002] Electron impact ionization (EI) is a mature and effective ionization technology. It...
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IPC IPC(8): H01J49/16
CPCH01J49/161H01J49/145
Inventor 侯可勇陈文东花磊陈平蒋吉春李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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