Optic Radiations and Chemical Reactions in Bromoform under Shock Compressions

Multi-channel optic pyrometer was used to observe shock temperatures of bromoform in the pressure range from 37 to 85 GPa and thermal relaxation behavior at bromoform/sodium chloride crystal interface. The radiation time histories from shocked bromoform exhibit a two-step structure as the pressure reaches 46 GPa or higher, which return to the usual one-step profile as the pressure goes up to 85 GPa. The observed shock temperatures agree well with the reported data at pressures less than 50 GPa; at pressures higher than 76 GPa, it increases abruptly. Based on the above results and the thermal relaxation behavior at CHBr3/NaCl interface, we proposed a time-delayed exothermal chemical reaction model to describe the shock compression process occurring in bromoform under shock pressure from 46 to 85 GPa.