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Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry

An ion mobility spectrometry and photoemission technology, applied in the new ionization technology field, can solve the problems of complicated instruments, and achieve the effect of simplifying the reaction, avoiding trouble, and improving the sensitivity

Inactive Publication Date: 2010-03-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To eliminate this effect, Swenson used mirrors to prevent light from entering the reaction area, but this made the instrument more complex on the other hand.

Method used

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  • Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry
  • Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry
  • Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] image 3 The photoemission ionization source and 63 Mobility spectra of reagent ions obtained from Ni source. It can be seen from the figure that the reagent ion migration time obtained by the two ionization sources is different, and the reagent ion peak obtained by the photoemission ionization source is at 14.91ms, 63 The reagent ion peak obtained from the Ni source is at 15.36ms. This shows that their corresponding ions are also different. The reagent ion obtained by photoemission may be CO 3 - (H 2 O) n-1 ,and 63 The reagent ion obtained from Ni source may be O 2 - (H 2 O) n . At the same time, we can see that the reagent ion peak ratio of the photoemission ionization source 63 The reagent ion peak obtained by the Ni source is much stronger, about 63 5 times that of the Ni source reagent ion peak, which shows on the one hand that the sensitivity of the photoemission ionization source is higher than 63 The source of Ni is high.

Embodiment 2

[0040] Figure 4 Shown are the mobility spectra of four explosives (TNT, RDX, HMX and PETN) obtained using a photoemission ionization source combined with ion mobility spectrometry. As can be seen from the figure, all four explosives are well detected. The four explosives all obtained a product peak (T1, R1, H1 and P1) at a migration time of 17.70ms, NO 3 The group cluster ion——NO 3 - ·Y (Y stands for H 2 O, HNO 3 equal molecules). At the same time, they also have their own characteristic peaks - TNT has a characteristic peak (T2) at 23.14ms; RDX has a characteristic peak at 25.84ms; HMX presents two characteristic peaks (H2 and H3), at 25.90ms and 28.50ms; PETN has a characteristic peak at 30.74ms.

Embodiment 3

[0042] Figure 5 Given is the photoemission ionization source coupled with ion mobility to detect halogen compounds (CH 2 Cl 2 , CH 2 Br 2 , CH 3 I) Migration spectrum. It can be seen from the figure that the three halogen compounds are also well detected and resolved. CH in the figure 2 Cl 2 The characteristic peaks at 15.45ms and 17.80ms, CH 2 Br 2 The characteristic peaks are at 14.36ms, 16.35ms and 18.45ms, CH 3 The characteristic peaks of I are at 18.07ms and 20.16ms.

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Abstract

The invention relates to a photoemission ionization source, which utilizes photoelectric effect generated when ultraviolet light irradiates metal and photochemical reaction generated when the ultraviolet light irradiates a carrier gas. The photoemission ionization source comprises three parts, namely an ultraviolet light source, a metal mesh or a metal ring, and the carrier gas. The ultraviolet light irradiates the surface of the metal mesh or an inner ring of the metal ring to generate low-energy photoelectrons. The photoelectrons can be adsorbed onto an object to be tested to ionize the object, and simultaneously the photoelectrons can be adsorbed onto a product of the photochemical reaction of the carrier gas, namely O3 to generate O3<->. The O3<-> or aqua ions thereof, namely O3<->(H2O)n are reacted with CO2 in air to generate Co3<->(H2O)n (n=0-3); and the Co3<->(H2O)n can be used as an ion of a reagent to react with the object to be tested to ionize the object to be tested. When the photoemission ionization source is applied to ion mobility spectrometry, the use of a radioactive ionization source can be avoided, the sensitivity of the ion mobility spectrometry is improved andthe industrialization of the ion mobility spectrometry is facilitated.

Description

technical field [0001] The invention relates to an ionization source in an analysis instrument, specifically a new ionization technology, which can avoid the use of radioactive ionization sources and improve the sensitivity of the ion mobility spectrum by using the new ionization technology for ion mobility spectrometry, which is beneficial to Industrialization of ion mobility spectrometer. Background technique [0002] Ionization source is one of the key technologies of analytical instruments such as ion mobility spectrometry. The ionization source commonly used in traditional ion mobility spectrometry is radioactive 63 Ni ionization source. 63 Ni can emit β-rays with an average energy of 17Kev, undergo a series of complex reactions with the carrier gas, and finally form reagent ions H 3 o + (positive ion detection mode) and O 2 - (Negative ion detection mode), the reagent ions react with the sample to be tested, so that the sample to be tested is ionized. radioactivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J27/24H01J49/16G01N27/64
Inventor 李海洋董璨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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