Absorption Spectrum of NO3 and Kinetics of the Reactions of NO3 with NO2, Cl, and Several Stable Atmospheric Species at 298 K

Article abstract of DOI:10.1021/j100268a038

The absorption spectrum of NO3 has been measured between 615 and 670 nm in the photolysis of Cl2-ClONO2-N2 and F2-HNO3-N2 mixtures.The absorption cross section was found to be (1.19 +/- 0.36) x 10^-17 cm² molecule^-1 at 622.3 nm, and this leads to a value of (1.85 +/- 0.56) x 10^-17 cm² molecule^-1 at 662 nm in good agreement with most recent studies.The rate coefficient for the reaction NO3 + NO2 -> N2O5 was measured to be (4.8 +/- 0.3) x 10^-13 and (5.8 +/- 0.8) x 10^-13 cm³ molecule^-1 at total pressures of 24 and 40 torr of N2, respectively.A rate coefficient for the reaction between Cl and NO3 was derived from the NO3 behavior in the photolysis of Cl2 and ClONO2 mixtures and its value at 298 K is (2.7 +/- 1.0) x 10^-11 cm³ molecule^-1 s^-1.In addition, upper limits were determined for the rates of reaction of NO3 with SO2, CO, CH4, H2O2, and CS2.