DETERMINATION OF RATE CONSTANTS AND EQUILIBRIUM-CONSTANTS OF RI REVERSIBLE R + I AND I + RI REVERSIBLE I-2 + R FOR R=CF-3, C2F5, OR C4F9

It is shown that the method of isothermal pyrolysis of iodide RI allows the equilibrium constant (K(C,l) = k(l)/k(-l)) of the reaction RI reversible k-5k5 R + I and I + RI reversible k-2k2 R + I2, to be measured with great accuracy if the rate constant of the recombination R + R --> R2 is known. If in this case the value of k-5 is known, it is also possible to find the absolute values of k5, k2, and k-2. In this way k2 (T), k-2(T), and k5(T) were measured in the high concentration limit for CF3I (in the 628-795 K range), C2F5I (in the 610-790 K range), and C4F9I (in the 590-694 K range). The dissociation energies of these same iodides E(D)(R-1) were found.