Temperature Dependence of the Rate Constant for the Reaction F(2P) + Cl2 → FCl + Cl at T = 180−360 K

The absolute rate constant for the reaction F( 2 P) with Cl 2 has been measured using the discharge flow kinetics technique coupled to mass spectrometric detection at T = 180−360 K and 1 Torr He nominal pressure. Experiments were performed at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD, and Laboratoire de Combustion et Systemes Reactifs-CNRS in Orleans, France. Results of k = (5.7 ± 0.8) × 10 -11 and (6.2 ± 0.8) × 10 -11 cm 3 molecule -1 s -1 independent of temperature were obtained by each laboratory, respectively. When the results from both laboratories were combined into one data set, an average temperature independent value of k 1 = (6.0 ± 1.1) × 10 -11 cm 3 molecule -1 s -1 was obtained. A very slight positive temperature dependence with k 1 ( T ) = (6.5 ± 1.5) × 10 -11 exp{−(20 ± 60)/ T } cm 3 molecule -1 s -1 may also be derived from the combined data in the range T = 180−360 K.