Based on commercial VUV lamps, the DICP Research Group No.102 led by Prof. Haiyang Li has succeeded in developing a new type of doper-enforced VUV anion ionization source. By combining this new ionization source with Ion Mobility Spectrometer (IMS）, it was possible to determine traces of explosives. Experimental results showed that, for typical commercial nitro-ammonium explosives(ANFO) and military explosives TNT and DINA, the determination limit was 10 pg, 80 pg and 100 pg, respectively. Moreover, analysis of the reagent ions by Time-of-Flight Spectroscopy revealed for the first time that CO₃-(H₂O)nwas the main reagent ion, which was different from that determined by the 63Ni source. Utilizing this reagent ion to react with ANFO, TNT and DINA explosives, the sample ion peak and the reagent ion peak could be better separated, thus minimizing false positives. Furthermore, CO₃-(H₂O)n could combine directly with explosives, thus the ionization rate could be enhanced. The results of this work has been published on-line in Analytical Chemistry （http://pubs.acs.org/doi/abs/10.1021/ac302836f）.