Excitation state molecular collision surface desorption electric dissociation ion transfer spectrum detection method and apparatus

Abstract

The invention discloses a detection method and a device for ion mobility spectrometry of excited state molecular collision surface desorption ionization, an excited state generator is arranged in front of an ion entrance of a mobility tube of the ion mobility spectrometry, a placement region of the samples to be measured is arranged between the excited state generator and the ion mobility spectrometry, which is exposed in the atmosphere directly, the excited state generator includes a discharge cavity, the front end of the interior of the discharge cavity is connected with a discharge part, the back end of the discharge part is equipped with an ion filter door and an exclusion electrode sequentially, the back end of the exclusion electrode is an outlet of the discharge cavity, and an ion introducing electrode is arranged in the mobility tube of the ion mobility spectrometry. The invention can work in the open atmospheric environment, the measured surface does not need the pretreatment, the invention can realize the desorption ionization and rapid detection in situ of the trace components on the surface of the object, the invention can not only be used for analysis and detection of the surface pesticide residues, but can also be applicable to the detection of the toxic and harmful dangerous goods on the surface of the object. The invention is characterized by rapid detection speed, high sensitivity, small volume of the device, easy operation and so on.

Description

technical field [0001] The invention relates to a detection and analysis technology for trace substances on the surface of articles, in particular to a detection method and device for excited state molecule collision surface desorption ionization ion mobility spectrometry, which can work in an open atmospheric environment and can directly detect trace substances on the surface of articles In situ desorption ion mobility spectrometry detection was performed. Background technique [0002] Ion mobility spectrometry uses the different moving speeds of different ions in an electric field under atmospheric pressure to realize the separation and detection of substances. Ion mobility spectrometry technology was invented in the 1960s, and its application in the field of analysis began in the middle of the 20th century. In the past 10 years, ion mobility spectrometry equipment has been used for component analysis of toxic and dangerous goods. The ion mobility spectrometer is mainly c...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult for this type of ion source ion mobility spectrometry technology to realize the in-situ detection of surface substances on objects.

In addition to the need for sampling procedures such as swabbing, there is also the possibility of loss and contamination of the measured substance

[0004] (2) Electrospray ionization ion source ion mobility spectrometry is usually used for direct detection of substances in liquids. Although desorption electrospray ionization technology has recently been used for the detection and analysis of surface substances, special electrospray solvents are required, and The use of solvents may cause pollution of the surrounding environment

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