Atmospheric Chemistry of Tetrachloroethene (Cl2CCCl2):  Products of Chlorine Atom Initiated Oxidation

The products following Cl atom initiated oxidation of C2Cl4 at 700−760 Torr of air and 230−299 K in the presence and absence of NO x were investigated using three different FTIR smog chamber techniques. There was no measurable effect of temperature on the product yields. CCl3C(O)Cl and COCl2 were formed with molar yields of 68 ± 6% and 77 ± 12% in the presence of NO x and 87 ± 11% and 32 ± 4% in the absence of NO x . These results give branching ratios for the CCl3C(O)Cl and COCl2 forming channels of 0.64 and 0.36 in the presence of NO x and 0.84 and 0.16 in the absence of NO x . Contrary to a recent report by Hasson and Smith (J. Phys. Chem. A, 1999, 103, 2031), variation of the initial C2Cl4 by a factor of 300 over the range (0.016−5.6) × 1014 molecule cm-3 had no discernible effect (