摘要
1 Introduction The reaction of H （or D） atoms with Br<sub>2</sub> molecules is one of the typical heavy-light-heavy （HLH） kinetic systems. Studies on its experiments and theories have aroused great interest for a long time. Jaffe and Clyne measured the reaction rate constants for the H+ Br<sub>2</sub> system at 295 K with a discharge flow-resonance absorption （DFRA） technique. To study the properties of the transition state, the measurement of
