KINETICS OF O((1)D) REACTIONS WITH BROMOCARBONS

The rate coefficients for the removal of O(1D) by reaction with the fo llowing seven bromocarbons were measured using time-resolved vacuum UV atomic resonance fluorescence detection of (O(P))-P-3: CH3Br, CH2Br2, CHBr3, CF3Br (Halon-1301), CF2Br2 (Halon-1202), CF2ClBr (Halon-1211), and CF2BrCF2Br (Halon-2402). The branching ratios for the quenching o f O(1D) to O(P))-P-3 by the above molecules were also determined. From these measurements, the rate coefficients for reactive and nonreactiv e loss of O(1D) were calculated. These results are discussed in terms of their atmospheric relevance and trends in reactivity of O(1D) with hydrocarbons upon halogen substitution.