Fig. 1. Measurement system

Fig. 2. Original absorption cross section at 190~300 nm (a—j) and differential absorption cross section (k) of C₆H₆

Fig. 3. Correlation matrices between C₆H₆ and other interference gas absorption cross sections

Fig. 4. Reference spectrum (a) and residual noise (b)

Fig. 5. Example of differential absorption spectrum measured in mixed gas experiment
Ratio of gas concentration SO₂:C₆H₆:NH₃=2:1:1

Fig. 6. Retrieval results of mixed gas

Fig. 7. Example for C₆H₆ fitting at 195~208 and 240~260 nm
(Spectrum measured on January 14, 2019, 13:28)

Fig. 8. Concentration distribution of C₆H₆ in a chemical park