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The data on ZIÍczFíHz/RczFiHi with added Nz at 391°K may well be better represented by a small positive intercept at ~0.05, but it is apparent that a large number of runs would have to be performed (see for instance ref 22) to permit a clear-cut determination as to the existence of an intercept, or not.(32) Similarly, so did plots of ñcia/ñczFsHs and Rtram/RciFtSi, although any difference in behavior of these two functions would certainly not be anticipated.(33) The data in Figure 7 only show the ratio of the products, but the absolute amount of elimination products is, of course, reduced with increasing pressure.

Evidence is presented that the vibrationally "hot" molecule CF2HCD3*, formed by the combination of CF2H and CD3 radicals, may decompose by three competing unimolecular processes to form CFH=CD2 + DF, CFD=CD2 + HF, and CF2=CD2 + HD. The second process, a three-center a,a. elimination of HF from the same carbon atom, has not previously been observed. The evidence for the third process, HD elimination, is more tentative. An estimation of the Arrhenius parameters for the decompositions using classical Rice-Ramsperger-Kassel (RRK) theory is made, and the effect of collisional quenching of the "hot" molecules is discussed in terms of the critical energies for the eliminations. A similar experiment with CFH2CD3* showed no a,a elimination of 18, 122 (1964).

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