Journal of Physical Chemistry A, Vol.121, No.44, 8341-8347, 2017
Kinetics and Products of the Reactions of Fluorine Atoms with CINO and Br-2 from 295 to 950 K
The kinetics and products of the reactions of F atoms with Br-2 and CINO have been studied in a flow reactor coupled with an electron impact ionization mass spectrometer at nearly 2 Torr total pressure of helium and over a wide temperature range, T = 295-950 K. The rate constant of the reaction F + CINO -> products (1) was determined under pseudo-first order conditions, monitoring the kinetics of F atom consumption in excess of CINO. The measured temperature independent rate constant, k(1) = (1.29 +/- 0.13) X 10(-10) cm(3) molecule(-1) s(-1) (T = 299-950 K), was found to be in excellent agreement with the only previous low temperature study which allowed to recommend the value of k(1) in an extended temperature range, 228-950 K. FCl and Cl atoms were observed as the reactions products (corresponding to two reaction pathways: Cl-atom abstraction and replacement with fluorine atom, respectively) with the independent of temperature, in the range 295-948 K, yields of 0.68 +/- 0.10 and 0.32 +/- 0.05, respectively. Rate constant of the reaction F + Br-2 (2), k(2) = (1.28 +/- 0.20) X 10(-10) cm(3) molecule(-1) s(-1), determined using both absolute and relative rate methods, was found to be independent of temperature at T = 299-940 K.