Chlorine and bromine oxides: synthesis, structure, and role in heterogeneous processes of stratospheric ozone decomposition

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Heterogeneous chemical reaction of ozone with HBr and HCl adsorbed on the ice surface have been investigated under the temperatures 77-223 K. The process occurs immediately with formation of dark brown, gold-yellow and yellow-orange colored condensates in the case of HBr and red condensate with HCl. Accordingly to low temperature IR-spectroscopy in the case of hydrogen chloride the most thermodynamically stable ClO 2 is the dominant product of the reaction. In the csae of HBr Br 2 O forms initially. Then it suffers further sequential oxidation to Br 2 O 3 , BrO 2 (Br 2 O 4 ) and Br 2 O 5 . The optimization of the geometry of chlorine and bromine oxides mentioned above, has been performed using ab initio quantum mechanical calculations.