The occurrence of detonation velocities in excess of the equilibrium C-J predictions in the Hydro- gen-Chlorine mixture due to the chemical kinetics of the H_2-Cl_2 system is investigated experimentally and numerically. The new results conclusively determine the pathological nature of the H_2-Cl_2 sys- tem and confirm the hypothesis of Zel'dovich and Ratner (1941) and Guenoche et al. (1981) regard- ing the kinetics of this mixture.
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