Chlorofluorocarbons photodissociate to produce chlorine atoms, cl•, which have been implicated in decreasing the concentration of ozone, o3, in the stratosphere. the decomposition of the ozone follows a reaction sequence of o3 cl• -> clo• o2 clo• o -> cl• o2 what role (factor affecting reaction rates) do chlorine atoms have in increasing the depletion rate of ozone