Crossed-beam investigation of translational energy effects in oxygen atom reactions

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Abstract
The reactions of oxygen atoms with I2, CS2, and OCS have been investigated using crossed molecular beams, for two mean collision energies (∼5 and ∼30 kJ mol−1). The reaction O+I2→IO+I exhibits an unexpected change in behavior from long-lived complex formation at low energy to a backwards-scattering rebound mechanism at higher energy. Translational energy is very effective in overcoming the small activation barrier to the O+CS2→SO+CS reaction, but appears ineffective in promoting the analogous reaction O+OCS→SO+CO, which has a higher activation energy.