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

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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.