The NO2 absorption spectrum .4. The 200-400 nm region at 220 K

Previous experiments in the 400-500 nm region (Coquart ei al., 1995) have been extended to the 200-400 nm region to determine the absorption cross-sections of NO2 at 220 K. The NO2 and N2O4 cross-sections are obtained simultaneously from a calculation applied to the data resulting from measurements at low pressures. A comparison between the NO2 cross-sections;It 220 K and at ambient temperature shows that the low temperature cross-sections are generally lower, except in the region of the absorption peaks. Comparisons are also made with previous data at temperature close to 220 K.