Lawrence Livermore National Laboratory, University of California, Livermore, California 94550, USA.
J Chem Phys. 2013 Jul 14;139(2):024502. doi: 10.1063/1.4812374.
We use double pass absorption spectroscopy to examine shock induced reactions in situ in cyclohexane and benzene at pressures up to 33.1 GPa. Reactions in cyclohexane begin by 27 GPa and complete by 33.1 GPa. Reactions in benzene are observed to begin by 12 GPa and are complete by 18 GPa. Absorption spectra indicate that the first reaction in cyclohexane occurs within or near the shock front, and that a metastable local equilibrium is reached in the post-shock state. A second process may be observed upon reshock at the lower pressures, suggesting a new equilibrium is reached post-reshock as well. Absorption bands are consistent with the formation of short radicals or fragments upon decomposition; however, spectral resolution is too low to confirm this mechanism.
我们使用双通吸收光谱法在高达 33.1 GPa 的压力下原位研究环己烷和苯中的冲击诱导反应。环己烷中的反应在 27 GPa 时开始，在 33.1 GPa 时完成。在 12 GPa 时观察到苯中的反应开始，并在 18 GPa 时完成。吸收光谱表明，环己烷中的第一个反应发生在冲击前沿内或附近，并且在冲击后状态下达到了亚稳局部平衡。在较低压力下重新冲击时可能会观察到第二个过程，这表明重新冲击后也达到了新的平衡。吸收带与分解后短自由基或碎片的形成一致；然而，光谱分辨率太低，无法确认这种机制。
