Storing type photo-ionisation ion migration mass spectrum

A ionization and storage technology, applied in the field of mass spectrometers, can solve problems such as weak signals and complex line spectra, and achieve the effects of reducing the impact of noise, improving collection efficiency, and improving sensitivity

Inactive Publication Date: 2004-11-10
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem in the prior art that the measured line spectrum is complicated and the signal obtained is weak due to the use of radioactive elements as the ionization s...

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  • Storing type photo-ionisation ion migration mass spectrum
  • Storing type photo-ionisation ion migration mass spectrum
  • Storing type photo-ionisation ion migration mass spectrum

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Embodiment Construction

[0015] like figure 1 As shown, the ionization light source of the present invention adopts the vacuum ultraviolet lamp 2, which generates photons with an energy of 10.6 eV. The ion storage area is composed of the front grid and its electrodes 3 , the middle grid and its electrodes 4 , and the rear grid and its electrodes 5 . The electrode is a ring electrode, called electrode ring, with an outer diameter of 50 mm, an inner diameter of 40 mm, and a stainless steel ring with a thickness of 3 mm. The grid is a chemically etched nickel mesh with a thickness of 0.2 mm, such as image 3 shown. The acceleration grid electrode 1 is connected to the output end of the high voltage power supply-8, that is, the high voltage end. The plate electrode 11 is connected to the ground terminal of the high voltage power supply-8. The sample gas enters the ionization region 24 through the sample inlet 22, and the molecules whose ionization energy is lower than 10.6ev are ionized by the vacuum u...

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Abstract

The invention relates to a storage photoionization ion migration mass spectrum, mainly solving the problems of the complex line spectrum measured and weaker signals obtained by adopting radioactive component as ionization source. It includes acceleration grid electrode, ionization light source, sampling mouth, ionization region, drift region and ion collecting plate, and its character: the ionization light source is vacuum ultraviolet lamp, it sets an ion storage region structure between the ionization and drift regions to replace the ion gate. It has ion storing function, largely enhances monitoring sensitivity, clear migration mass spectrum chart of the matter to be measured, reduces influence of noise and enhances collecting efficiency.

Description

technical field [0001] The invention relates to a mass spectrometer, in particular to a photoionization ion mobility mass spectrometer. Background technique [0002] Ion mobility mass spectrometry is a type of mass spectrometer that operates at atmospheric pressure. The principle is: under atmospheric pressure, under the action of a uniform weak electric field E, the ions will accelerate along the direction of the electric field force, and at the same time collide with the gas molecules continuously. As a result, the ions drift at a certain speed V, where v is : v=KE, K is the reduced mobility constant. At low field strength, the mobility constant K of ions is a constant of the molecular structure properties and has nothing to do with the electric field strength. In this way, ions with different mobility speeds move at different speeds in the drift region, and they arrive at the detector at different times. By detecting the magnitude of the current of the detector at diff...

Claims

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Application Information

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IPC IPC(8): G01N27/64
Inventor 李海洋阚瑞峰邵士勇
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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