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The thermal exchange of chlorine between Af and liquid Af is readily measurable at temperatures in the range of 180-degrees and above.

The photochemical exchange occurs with a quantum yield of the order of unity in the liquid phase at 65-degrees using light absorbed only by the Af.

In the gas phase, with Af of Af and Af of Af, quantum yields of the order of Af have been observed at 85-degrees.

Despite extensive attempts to obtain highly pure reagents, serious difficulty was experienced in obtaining reproducible rates of reaction.

It appears possible to set a lower limit of about Af for the activation energy of the abstraction of a chlorine atom from a carbon tetrachloride molecule by a chlorine atom to form Af radical.

The rate of the gas phase exchange reaction appears to be proportional to the first power of the absorbed light intensity indicating that the radical intermediates are removed at the walls or by reaction with an impurity rather than by bimolecular radical combination reactions.