Kinetic and mechanistic study of the reaction of O(1D) with CF2HBr

✍ Scribed by R. S. Strekowski; J. M. Nicovich; P. H. Wine

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 166 KB
• Volume: 33
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.1019

✦ Synopsis

A laser flash photolysis-resonance fluorescence technique has been employed to investigate the kinetics and mechanism of the reaction of electronically excited oxygen atoms, O( 1 D), with CF 2 HBr. Absolute rate coefficients (k 1 ) for the deactivation of O( 1 D) by CF 2 HBr have been measured as a function of temperature over the range 211-425 K. The results are well described by the Arrhenius expression k 1 (T) ϭ 1.72 ϫ 10 Ϫ10 exp(ϩ72/T) cm 3 molecule Ϫ1 s Ϫ1 ; the accuracy of each reported rate coefficient is estimated to be Ϯ15% (2). The branching ratio for nonreactive quenching of O( 1 D) to the ground state, O( 3 P), is found to be 0.39 Ϯ 0.06 independent of temperature, while the branching ratio for production of hydrogen atoms at 298 K is found to be . The above results are considered in conjunction with other ϩ0.01 0.02 Ϫ0.02 published information to examine reactivity trends in O( 1 D) ϩ CF 2 XY reactions (X,Y ϭ H, F, Cl, Br).