Photolysis of NO2 in the presence of SO2 at 3660 Å

Abstract

Nitrogen dioxide was irradiated at 3660 Å in the presence of SO₂. Quantum yields were measured as a function of SO₂ pressure, and the specific rate constant for O+SO₂→SO^*₃ was determined to be (1.1±0.1)× 10⁹ l. mole^–1 sec^–1. The ratio of rate constants for the proposed reactions: SO^*₃→O+SO₂ and SO^*₃+M→SO₃+M, was estimated to be 0.077 mole l.^–1 by the combination of the results of quantum yields with those of isotopic oxygen scrambling. A dark reaction was also observed which, if attributed to a simple bimolecular process, yields k_D= 3.7 × 10^–3 l. mole^–1 sec^–1.