No abstract

No abstract

No abstract

The first experimental study of the reaction CIO + CH302 -* products (1) is reported. The rate coefficient Aq and the product distributions were investigated in the modulated photolysis of Cl2/CH4/Cl20/02 mixtures. Reactants and products have been monitored by using UV-vis and Fourier-transform infrared gas-phase absorption spectroscopies. The value of A, was found to be equal to (3.1 ± 1.7) X 10"12 cm3 molecule"1 s'1 at 300 K and 240 Torr total pressure. The product channel forming ClOO and CH30 appears to be the dominant pathway at 300 K. The subsequent oxidation of CH30 to CH20 and its partial photolysis into Ff and HCO leads to enhanced production of odd hydrogen (OH, H02) radicals. Consequently, high concentrations of OH radicals can build up, leading to an additional source of active chlorine via the reaction HC1 + OH -Cl + H20, which destroys ozone by catalytic reactions. This strongly suggests that reaction 1 can play a substantial role in the photochemical processes that take place under stratospheric "ozone hole" conditions. 1986, 321, 755.

No abstract