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Method for laser desorption and ionization

A laser desorption and desorption technology, which is used in material analysis, measuring devices, and instruments by electromagnetic means. It can solve the problems of difficult ionization analysis and no reports on the application of organic analysis, so as to achieve a wide range of applications and prevent sample contamination. , the effect of simplifying the identification process

Inactive Publication Date: 2012-05-09
XIAMEN UNIV
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Problems solved by technology

These techniques can ionize solid or solution samples, but the dependence on sample pretreatment methods has caused some limitations in their practical application, especially when encountering some insoluble, thermally unstable and air-sensitive samples. ionization analysis
High-energy laser ionization mass spectrometer is a new multi-functional solid analysis and detection tool. It has outstanding performance in inorganic analysis, especially element qualitative and quantitative analysis, but its application in organic analysis has not been reported yet.

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  • Method for laser desorption and ionization
  • Method for laser desorption and ionization

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Embodiment Construction

[0023] The following embodiments will describe the present invention in detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0024] The present invention comprises the following steps:

[0025] 1) A laser light source is used to irradiate the surface of the sample to form a crater, and the organic compound molecules around the crater undergo thermal desorption, and the organic compound molecules are desorbed into gaseous molecules. The wavelength of the laser light source can be 157-1100 nm, the pulse width can be 100 fs-100 ns, the pulse energy can be 1 μJ-1000 mJ, the pulse frequency can be 1 Hz-1 MHz, and the beam diameter of the laser light source can be 1-10 mm; The power density of the laser light source irradiating the sample surface can be 10 8 ~10 12 W / cm 2 , the angle between the light beam irradiated by the laser light source and the sample surface can be 1° to 179°; the sample can be an organ...

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Abstract

The invention provides a method for laser desorption and ionization, and relates to detection of organic compounds. The invention provides a method for laser desorption and ionization of an organic compound. According to the method, a laser light source is adopted to irradiate the surface of a sample to form a crater; organic compound molecules around the crater are subjected to thermal desorption, such that the organic compound is desorbed into the gas molecules; collision is generated between the desorbed molecules and the high energy electrons or protons generated by the laser, such that the desorbed molecules are subjected to ionization to form the molecular ions with the free radicals form, and the like; a mass analyzer is adopted to analyze the molecular ions with the free radicals form, and the like. With the method, organic solid samples, organic powder samples, inorganic or organic coated organic core particles, organic liquid residues, organic gas sediments, aerosol sediments and the like can be directly analyzed; the matrix-assisted ionization is not required so as to prevent the sample from contaminating, and a wide application range is provided; more ions and fragmentation information can be acquired during the organic compound detection process so as to simplify the identification process of the sample.

Description

technical field [0001] The invention relates to the detection of organic compounds, in particular to a method for laser desorption and ionization of organic compounds. Background technique [0002] Conventional detection methods for organic compounds mainly include spectroscopic analysis and mass spectrometry. Among them, spectroscopic analysis is one of the most basic research methods in chemical detection, which also includes infrared spectroscopy, Raman spectroscopy and ultraviolet-visible absorption spectroscopy. Spectral analysis technology was widely used in this field as the main means of studying organic compounds in the early days. However, the performance of spectroscopic analysis in terms of directivity and specificity was not satisfactory, which also limited its application in substance identification. application. When analyzing unknown samples, it is only suitable as an auxiliary means to provide more molecular structure information, and the real qualitative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
Inventor 杭纬
Owner XIAMEN UNIV
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