Abstract
Recent kinetic experiments on the reaction of CIO with HO2 indicate the reaction rate constant is sufficiently fast to promote the formation of HOCI in the atmosphere. HOCI is being studied as a potential sink for chlorine atoms, since the removal of chlorine atoms can prevent the chain destruction of stratospheric ozone. Disagreement currently exists regarding the ultraviolet absorption characteristics of HOCI and therefore over its photodissociation rate and atmospheric lifetime. This study shows that HOCI can be formed by irradiation of H2O2/CI2/O3 mixtures. The formation of HOCI was monitored by long path infrared spectroscopy prior to obtaining the ultraviolet absorption spectra. The ultraviolet absorption of HOCI was measured and the cross sections extended beyond 3000 A.
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