Fig. 1. Schematic diagram of experimental device

Fig. 2. Spectral information of H, O and N in the air

Fig. 3. The spectral intensity of three elements in air varies with air pressure

Fig. 4. Structural formulae of TNT and RDX

Fig. 5. CN and spectral lines of RDX in air

Fig. 6. Comparison of spectral intensities of RDX and TNT in air

Fig. 7. CN and spectral lines of RDX at low air pressure

Fig. 8. Comparison of spectral intensities between RDX and TNT at low air pressure

Fig. 9. Comparison of spectral lines intensities between RDX and TNT under different conditions