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摘要: 利用多通道光学高温计测量了溴仿在37 GPa到85 GPa压力范围内的温度，并观察了溴仿/单晶氯化钠界面的热驰豫过程。结果发现，当冲击波压力升高到46 GPa时，溴仿的光辐射强度随时间的变化呈现出双阶梯或双台阶形状的剖面结构，且台阶之间的时间间隔随冲击压力的增高而减小。当压力达到85 GPa时，上述双台阶结构消失，呈现为普通的单台阶剖面结构。冲击波温度测量表明，当压力低于50 GPa时，实测温度与Gokulya报道的数据一致；当压力增至76 GPa以上时，冲击波温度出现突跃性增加。结合对溴仿/氯化钠界面上的热驰豫过程的分析，文中提出，溴仿在上述冲击压力区间内发生了一次带有时间驰豫（或化学诱导期）的化学放热反应。Abstract: 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.
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