Ionization Absorption Spectrum Detection Device Based on Multi-channel Electron Multiplier Device

An electron multiplier and detection device technology, applied in the field of ionization absorption spectrum detection, can solve the problems of high pressure and reduced measurement accuracy, etc.

Active Publication Date: 2018-05-25
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] However, in order to ensure that the collected signal has a better signal-to-noise ratio, the pressure of the gas to be measured in the ionization chamber is relatively high (10 -1 ~10 -3 torr), the increased gas collision broadening has an additional contribution to the peak width of the absorption spectrum, reducing the accuracy of the measurement

Method used

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  • Ionization Absorption Spectrum Detection Device Based on Multi-channel Electron Multiplier Device
  • Ionization Absorption Spectrum Detection Device Based on Multi-channel Electron Multiplier Device
  • Ionization Absorption Spectrum Detection Device Based on Multi-channel Electron Multiplier Device

Examples

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Effect test

example 1

[0054] In order to measure the working performance of the MCP and obtain its optimal working state, under the condition of not changing other conditions, the change curve of the count of the MCP with the pressure in the ionization chamber was measured (such as Figure 4 shown), the solid line in the figure is the result of linear fitting, it can be seen that the MCP is at a pressure of 10 -7 Within the range of torr (normal working air pressure), the working linearity is very good.

example 2

[0056] Using the ionization chamber based on the MCP detector, the absorption spectra of gases such as argon and nitrogen were measured respectively, and the energy resolution of the dream line in the corresponding energy range was obtained respectively. Such as Figure 5 with 6 They are the absorption spectra of argon and nitrogen respectively. It can be seen that the energy resolution (E / E) reaches 10382@243eV and 18000@400eV respectively.

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Abstract

The invention provides an ionization absorption spectrum detection device based on a multi-channel electron multiplier, comprising an ionization chamber for ionizing gas; a gold mesh arranged in the ionization chamber, which is arranged to collect the ionization chamber The ions produced by the ionization in the ionization chamber; the multi-channel electron multiplier arranged in the ionization chamber, its position is opposite to the position of the gold mesh, so as to form an electric field between the two, and receive all the electrons through the action of the electric field The ions collected by the gold net and output corresponding ion signals; the pressurization and signal acquisition circuit connected to the multi-channel electron multiplier, which is set to provide voltage to the multi-channel electron multiplier and collect and output the the ion signal; and a signal processing system, which is configured to receive the ion signal and obtain a corresponding ionization absorption spectrum according to the ion signal. The invention can improve the accuracy of the energy resolution of the measuring beam line, and reduce the influence of gas collision broadening on the final result.

Description

technical field [0001] The invention relates to the field of ionization absorption spectrum detection, in particular to an ionization absorption spectrum detection device based on a multi-channel electron multiplier device. Background technique [0002] Shanghai Synchrotron Radiation Facility (SSRF) is an advanced third-generation synchrotron radiation source, and its main performance indicators are among the top in the world. SSRF can generate a wide band from far infrared to hard X-rays, and is an irreplaceable advanced means and comprehensive research platform in many scientific researches such as life science, material science, environmental science, earth science, physics, chemistry, and information science. [0003] Dreamline is another high-performance line station following the seven beamline stations built in the first batch. It has a wide energy range (20-2000eV) and ultra-high energy resolution (greater than 10,000@1000eV) in the soft X-band ). Dreamline has two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64
Inventor 李俊琴邹鹰陈振华薛莲王勇邰仁忠
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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