Gruzdkov Y A, Winey J M, Gupta Y M
Institute for Shock Physics and Department of Physics, Washington State University, Pullman, Washington 99164-2816, USA.
J Phys Chem A. 2008 May 1;112(17):3947-52. doi: 10.1021/jp711872u. Epub 2008 Mar 21.
Time-resolved Raman scattering measurements were performed on ammonium perchlorate (AP) single crystals under stepwise shock loading. For particular temperature and pressure conditions, the intensity of the Raman spectra in shocked AP decayed exponentially with time. This decay is attributed to shock-induced chemical decomposition in AP. A series of shock experiments, reaching peak stresses from 10-18 GPa, demonstrated that higher stresses inhibit decomposition while higher temperatures promote it. No orientation dependence was found when AP crystals were shocked normal to the (210) and (001) crystallographic planes. VISAR (velocity interferometer system for any reflector) particle velocity measurements and time-resolved optical extinction measurements carried out to verify these observations are consistent with the Raman data. The combined kinetic and spectroscopic results are consistent with a proton-transfer reaction as the first decomposition step in shocked AP.
在逐步冲击加载下，对高氯酸铵（AP）单晶进行了时间分辨拉曼散射测量。在特定的温度和压力条件下，冲击后的AP中拉曼光谱的强度随时间呈指数衰减。这种衰减归因于AP中冲击诱导的化学分解。一系列冲击实验，峰值应力达到10 - 18 GPa，表明较高的应力抑制分解，而较高的温度促进分解。当AP晶体垂直于（210）和（001）晶面进行冲击时，未发现取向依赖性。为验证这些观察结果而进行的VISAR（任意反射体速度干涉仪系统）粒子速度测量和时间分辨光消光测量与拉曼数据一致。动力学和光谱学的综合结果与质子转移反应作为冲击后AP的第一步分解相一致。
