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Mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation

A technology of collision-induced dissociation and ionization source, which is applied to mass spectrometers, measuring devices, and parts of particle separator tubes, etc. problems, to achieve precise and qualitative analysis, small size, quantitative and accurate results

Active Publication Date: 2011-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the photon energy of this vacuum ultraviolet light is only a dozen eV. For most organic substances, only the molecular ion peaks can be obtained, and the rich structural information of organic substances cannot be obtained. accurate

Method used

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  • Mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation
  • Mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation
  • Mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation

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Embodiment 1

[0046] For the investigation of the collision-induced dissociation effect in the mass spectrometer VUV photoionization source device of the present invention, a sample gas of 100 ppm is configured with n-heptane for detection, the carrier gas is 99.999% high-purity nitrogen, and the mass analyzer adopts time-of-flight mass analyzer. Adjust the air pressure in the chamber of the ionization source to 0.15 Torr, keep it constant, and gradually increase the electric field strength at the lower end of the ion repeller electrode. The n-heptane mass spectrum signals measured under different electric field strengths are as follows: figure 2 shown. Visible at weaker electric field strengths (such as figure 2 2V / cm, but not limited to 2V / cm, depending on the pressure in the ionization source cavity), the ions in the ionization source are mainly sample molecular ions generated by VUV photoionization, and the obtained spectrum is simple, which can be determined according to the molecul...

Embodiment 2

[0049] In view of the examination of the performance of the mass spectrometer VUV photoionization source device of the present invention for quickly resolving isomers, taking the resolution of xylene and ethylbenzene isomers as an example, 99.999% high-purity nitrogen gas was prepared respectively as the carrier gas The 100ppm xylene and 100ppm ethylbenzene standard sample gases are detected, and the mass analyzer adopts a time-of-flight mass analyzer. During the measurement, the air pressure in the ionization source chamber was kept constant at 0.15 Torr. Under the same sample injection conditions, the mass spectra of xylene and ethylbenzene measured at different ionization source electric field strengths were as follows: Figure 4 shown. It can be seen that with the increase of the electric field strength of the ionization source, the m / z106 molecular ions of xylene and ethylbenzene will be dissociated by the collision-induced dissociation in the source to generate m / z91 fra...

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Abstract

The invention relates to a mass spectrum analyzer, in particular to a mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation, which comprises a sample injecting capillary tube, an ion repelling electrode, an ion accelerating electrode, a vacuum ultraviolet lamp, a side pumping valve and an ionization source cavity, wherein the ion repelling electrode and the ion accelerating electrode are placed in the ionization source cavity at interval in parallel, the sample injecting capillary tube passes through the outer wall of the ionization source cavity, and one end of the sample injecting capillary tube is arranged in a central small hole of the ion repelling electrodes; a light emitting window of the vacuum ultraviolet lamp is placed opposite to a gap between the ion repelling electrode and the ion accelerating electrode; and an air outlet is arranged on the side wall of the ionization source cavity, and the side pumping valve is connected with the air outlet through a pipeline. The mass spectrum VUV photoionization source device can be used together with any types of quality analyzers, can simultaneously obtain the molecular weight and the structural information of a matter to be analyzed and also be used for rapidly distinguishing isomerides by utilizing in-source collision induced dissociation.

Description

technical field [0001] The invention relates to a mass spectrometry instrument, specifically a mass spectrometer VUV photoionization source device for in-source collision-induced dissociation. The background gas undergoes collision-induced dissociation, and the device can obtain the molecular weight and structure information of the substance to be analyzed at the same time, and apply it to the rapid resolution of isomers. Background technique [0002] Volatile and semi-volatile organic pollutants usually have very low content in the environment, but they are toxic, irritating and carcinogenic, and cause various acute and chronic damage to the human body. Therefore, various organic pollutants in the environment The monitoring of has received close attention and been extensively studied. Due to its high sensitivity, fast detection speed, good universality, and accurate qualitative and quantitative characteristics, mass spectrometry is increasingly used as an on-site detection...

Claims

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Application Information

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IPC IPC(8): H01J49/16H01J49/34G01N27/64
Inventor 李海洋花磊吴庆浩崔华鹏陈平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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