Nonequilibrium kinetics of the reaction H+Br2 in xenon within a Lorentz gas model

The reaction H+Br2→products in the carrier gas xenon is studied in the framework of the Lorentz gas model. The nonequilibrium velocity distribution function fH of the light component H is calculated from the Lorentz–Fokker–Planck equation. This permits the determination of the nonequilibrium temperature TH and the nonequilibrium rate coefficient k of this reaction. These kinetic quantities are numerically calculated and compared with various other approaches for solutions of the appropriate Boltzmann equation (Kostin method, Chapman–Enskog and Shizgal perturbation method, Keizer approximation).