Research Reagent-New non-radioactive ionization source successfully developed to improve the accuracy of explosive identification

Recently, the research team of Li Haiyang, Dalian Institute of Chemical Physics, Chinese Academy of Sciences has successfully developed a new type of non-radioactive photoionization source that can quickly switch the reaction reagent ions CO3- and O2-. The accuracy of the identification of explosives has been published in the journal Analytical Chemistry of the American Chemical Society.
Because of its high sensitivity, fast detection speed, and portability, ion mobility spectroscopy has become the most widely used technology in the detection of trace explosives. However, false alarms are prone to occur in complex environments. How to improve the recognition accuracy of ion mobility spectra and avoid false alarms has always been a problem that needs to be solved urgently in this field for a long time.
The team found that different reaction reagent ions reacted with explosives to form different product ions and characteristic spectra. With simple gas flow switching, the non-radioactive dopant-assisted negative ion photoionization source can quickly switch the two reaction reagent ions CO3- and O2-, and the switching time is less than 2s. The combination of this ionization source and ion migration technology is used for the detection of typical explosives trinitrotoluene, hexorgin, ammonium nitrate and black powder. The experimental results show that the rapid switching of the two reactive reagent ions can be explosive The accurate identification provides more information, which is helpful to reduce the false alarm rate and enhance the accuracy of identification. In addition, it can also improve the peak-to-peak resolution of the product ion, enhance the detection sensitivity and expand the range of detectable explosives.
The results published in this paper are another progress on the basis of the dopant-assisted negative ion mode photoionization ion mobility spectroscopy (Anal. Chem. 2013, 85, 319-326) developed in the early stage.
A new type of non-radioactive ionization source invented by Dalian Chemical Institute to improve the accuracy of explosive identification

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