Measuring the Rate Constant of the Reaction between Chlorine
Atoms and CHF₂Br by Cl Atom Resonance Fluorescence

I. K. Larin^a, A. I. Spasskii^a, E. M. Trofimova^a, *, and N. G. Proncheva^b

^a Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences,
Moscow , 117829 Russia

^b Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow, 125047 Russia

*e-mail: eltrofimova@yandex.ru

Received August 19, 2015

Abstract—The rate constant of the reaction between Cl atoms and CHF₂Br has been measured by chlorine
atom resonance fluorescence in a flow reactor at temperatures of 295–368 K and a pressure of ~1.5 Torr. Lining
the inner surface of the reactor with F-32L fluoroplastic makes the rate of the heterogeneous loss of chlorine
atoms very low (k_het 5 s^–1). The rate constant of the reaction is given by the formula k = (4.23 0.13) 10^–
12e^{(–15.56 1.58)/RT} cm³ molecule^–1 s^–1 (with the activation energy in kJ/mol units). The possible role of this reac-
tion in the extinguishing of fires producing high concentrations of chlorine atoms is discussed.

Keywords: chlorine atom, refrigerants, resonance fluorescence, reaction rate constant, fire extinguishing

DOI: 10.1134/S0023158416030101

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