Radio-frequency electric field enhanced single photon and chemical ionization source

A chemical ionization source and electric field enhancement technology, which can be used in ion sources/guns, scientific instruments, parts of particle separator tubes, etc., and can solve problems such as fast movement, reduced reagent ion strength, and limited chemical ionization sensitivity. To achieve the effect of fast switching

Active Publication Date: 2014-08-06
SHENZHEN BREATHA BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the limited optical density of commercial vacuum ultraviolet light sources not only limits the sensitivity of single photon ionization, but also limits the number of photoelectrons, which reduces the reagent ion intensity, resulting in limited chemical ionization sensitivity.
Moreover, under higher air pressure conditions, electrons collide frequently with gas molecules. After the collision, energy needs to be regained from the electrostatic field to collide with the ionized molecules. Electrons have a short residence time in the ionization region, leading to inefficiencies in the acceleration of the photoelectron ionization reagent gas molecules by the electrostatic field

Method used

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  • Radio-frequency electric field enhanced single photon and chemical ionization source
  • Radio-frequency electric field enhanced single photon and chemical ionization source
  • Radio-frequency electric field enhanced single photon and chemical ionization source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] For the investigation of the radio frequency electric field enhancement effect of the ionization source described in the present invention, a commercialized Kr lamp with an emission photon energy of 10.6eV was used as a vacuum ultraviolet light source, and the ionization source was used in conjunction with a time-of-flight mass analyzer. Quartz capillaries with an inner diameter of Φ150 μm and a length of 30 cm were selected as sample gas injection tubes. The sample gas is 10ppm benzene (IE=9.24eV), toluene (IE=8.83eV), p-xylene (IE=8.44eV), and the sample gas is O 2 As the equilibrium gas, this experiment directly uses the equilibrium gas O 2 (IE=12.07eV) as a reagent gas. Adjust the air pressure in the chamber of the ionization source to 50Pa, and the gas injection volume is 20mL / min. The transmission electrode is composed of two electrodes. A DC voltage of 12V is applied to the first sheet, a DC power supply of 11V is applied to the second sheet, and a radio frequ...

Embodiment 2

[0042] For the performance investigation of the ionization source of the present invention to widen the range of analyte, sample gas is 10ppm chloroform (IE=11.37eV), selects the O of ionization energy higher than photon energy 10.6eV 2 (12.07eV) as balance gas and reagent gas. A quartz capillary with an inner diameter of Φ150 μm and a length of 30 cm was selected as the sample gas injection tube. Adjust the air pressure in the chamber of the ionization source to 50Pa, and the gas injection volume is 20mL / min. A DC voltage of 12V is applied to the first sheet, a DC power supply of 11V is applied to the second sheet, and a radio frequency voltage with a peak-to-peak value of 216V and a frequency of 7MHz is superimposed on the transmission electrode of the second sheet. A DC voltage of 5 V was applied to the differential hole electrodes. The distance between the three electrodes is 6mm. The size of the first transmission electrode and the grounding filter capacitor of the dif...

Embodiment 3

[0044] Under the same working conditions as in Example 2, different samples were changed to test the enhancement factor of the radio frequency electric field soft ionization source. Such as Figure 4 As shown, (a) is the sample whose ionization energy is less than photon energy 10.6eV, and the multiple is the comparison between radio frequency field chemical ionization and single photon ionization intensity; (b) is the sample whose ionization energy is greater than photon energy 10.6eV, the multiple is radio frequency field chemical ionization Comparison of chemical ionization strength produced by ionization and direct current field. The working conditions for chemical ionization in the DC field are as follows: DC voltage 150V is applied to the first plate of the transmission voltage, DC voltage 13V is applied to the second plate, and DC voltage 5V is applied to the differential hole electrodes. It can be seen from the figure that on the basis of including single-photon ioniz...

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Abstract

The invention relates to a mass spectrometer ionization source, in particular to a radio-frequency electric field enhanced single photon and chemical ionization source comprising a vacuum ultraviolet source, an ion generation and transmission area and a vacuum chamber vacuum cavity. A plurality of transmission electrodes and vacuum differential perforated electrodes are disposed in parallel and at intervals in the ion generation and transmission area. Each electrode is axially provided with a through hole. Ultraviolet emitted by the vacuum ultraviolet source enters the perforated electrodes along the axes. Direct-current voltage is applied to all transmission electrodes and perforated electrodes; radio-frequency voltage is superposed to one transmission electrode. Two different ionization ways are switched by controlling start and stop of the radio-frequency voltage. The radio-frequency electric field enhanced single photon and chemical ionization source comprises the single photon ionization source, the chemical ionization source is obtained through photoelectron ionization reagent gas obtained by means of photoelectric effect, radio-frequency electric field is introduced to the ionization area to enhance chemical ionization triggered by photoelectrons, detection sensitivity is improved, soft ionization of sample molecules with ionization energy higher than the energy of ultraviolet photons can be achieved, and range of analyzable samples is widened.

Description

technical field [0001] The invention relates to an ionization source of a mass spectrometer, in particular to a single photon-chemical ionization source enhanced by a radio frequency electric field. On the basis of including a single photon ionization source, the present invention uses the photoelectron ionization reagent gas obtained by the photoelectric effect to obtain a chemical ionization source, and introduces a radio frequency electric field into the ionization area to enhance the chemical ionization caused by photoelectrons, thereby improving the detection sensitivity and realizing the ionization energy Soft ionization of sample molecules above UV photon energy broadens the range of analyzed samples. By controlling the on and off of the radio frequency voltage, the switching between two different ionization modes can be flexibly realized. Background technique [0002] Electron bombardment ionization source (EI) is usually used in traditional organic mass spectrometr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/16G01N27/68
Inventor 李海洋陈平侯可勇花磊赵无垛谢园园陈文东渠团帅
Owner SHENZHEN BREATHA BIOTECHNOLOGY CO LTD
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