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New determinations of the disproportionation and combination ratios between CFZH and CzH5 radicals yield (the hydrogen acceptor radical is given first) A(CF2H, CzH5) = 0.068 t_ 0.008, and A(C2H5,CF2H) = 0.37 t_ 0.01. A reevaluation of the existing data on CFHP and CF3 radicals leads t o t h e following recommended values, h(CFH2,CzH5) = 0.038 t 0.006, and A(CF,,C,H,) = 0.11 = t_ 0.02.

A new determination of the disproportionation/cornbination ratio for C2Fs and CZH, radicals gives a value of A(C2F,, C2H,) = 0.24 5 0.02, independent of temperature. The cross-combination ratio for the two radicals was found to increase with temperature and the significance of this is discussed in evaluating A.

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