溴仿在冲击压缩下的光辐射及化学反应

 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。

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.