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Excited dibromomethane protonation enhancer

A technology of dibromomethane and protonization, which is applied in the direction of particle separation tube, ion source/gun, discharge tube, etc., can solve the problem of low detection efficiency, achieve the effect of low excitation photon energy, reduce the dosage, and improve the efficiency of protonization enhancement

Active Publication Date: 2018-10-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

However, for substances with small photoionization cross-sections such as aldehydes and alcohols, the detection efficiency of low-pressure ionization is not high.

Method used

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  • Excited dibromomethane protonation enhancer

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Embodiment Construction

[0010] The low-pressure photoionization source involved in the formation of the excited-state dibromomethane protonation enhancer and the enhancement of the protonation of organic substances consists of a vacuum ultraviolet light source 1, a lithium fluoride window 2, a reaction ionization region 3, an ion outlet 4, and a dibromomethane supply tube 5, The sample supply tube 6 consists of six parts. The specific implementation plan is as follows:

[0011] 1. The vacuum ultraviolet light source 1 generates vacuum ultraviolet light, which passes through the lithium fluoride window 2 and irradiates the reaction ionization region 3;

[0012] Two, methylene bromide is input reaction ionization zone 3 by methylene bromide supply pipe 5, and the input rate is controlled by other regulating devices;

[0013] 3. The gaseous sample to be measured is input into the reaction ionization zone 3 through the sample supply pipe 6, and the input rate is controlled by other regulating devices; ...

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Abstract

The invention relates to an excited state dibromomethane protonation enhancer and is a novel protonation enhancer. By virtue of the enhancer, the protonation efficiency of a polar organic matter can be improved in a low-air-pressure ionization process, thereby improving the detection capability of a low-air-pressure ionization mass spectrometer. Compared with difluoromethane and dichloromethane, dibromomethane has a relatively high optical absorption section, so that relatively more excited state molecules can be generated, more excited state dibromomethane protonation medium can be formed, and improvement of protonation enhancing efficiency can be facilitated; and in addition, dibromomethane is high in high-excited-state energy level, low in required excited photon energy, and can obtain an excited light source easily.

Description

technical field [0001] The excited-state dibromomethane protonation enhancer involved in the present invention is a new protonation enhancer, which can promote the protonation efficiency of polar organic substances in the low-pressure ionization process and improve the detection capability of the low-pressure ionization mass spectrometer. Compared with difluoromethane and dichloromethane, dibromomethane has a higher light absorption cross-section, which can generate more excited state molecules and form more excited state dibromomethane protonation media, which is beneficial to improve the protonation enhancement efficiency; Methyl bromide has a low energy level in the high excited state, requires low excitation photon energy, and the excitation light source is easy to obtain. Background technique [0002] Photoionization technology is a soft ionization technology widely used in chemical analysis. Among them, low-pressure photoionization is a new soft ionization technology d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/16
CPCH01J49/161
Inventor 束继年许策张海旭
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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