Electron paramagnetic resonance study of hydrogen and fluorine atom addition to SO2

Abstract

The electron paramagnetic resonance spectrum of the species formed in the near uv photolysis of mixtures of argon or krypton containing 1% HI and SO₂, 1% CF₃OF and SO₂, or F₂SO₂ has been investigated at 4.2 K. The species formed when an HI/SO₂ mixture is photolyzed has been identified as the symmetric σ radical HSO₂. The assignment of the principal components of the g and hyperfine tensors was aided by our observation of preferential orientation of the trapped radical. The species formed when a CF₃OF/SO₂ mixture is photolyzed in the far uv has been identified as the symmetric σ radical FSO₂. The g and A tensors have been determined from an exact solution of the spin Hamiltonian assuming a noncollinear tensor axis system.