冲击高压下硝基甲烷的拉曼光谱及其结构稳定性

在单次冲击压缩实验中,借助新建的瞬态拉曼光谱技术实现了对液态硝基甲烷冲击拉曼光谱的原位观测,来探究该样品分子在冲击波作用下的结构稳定性.实验发现,在10.6 GPa的冲击加载下硝基甲烷的拉曼特征峰仅发生了蓝移和展宽,而在观测波段未发现化学变化产生的迹象.这一结果否定了文献所报道的硝基甲烷在6 GPa~8.5 GPa的单次冲击压力区间内发生了化学反应的推论,同时也证实了在10.6GPa的冲击压力下硝基甲烷分子在约为516 ns的压缩时间内能够保持其结构的稳定.

Raman spectra and structural stability of liquid nitromethane under shock compression

In single shock experiments, In-situ observation on Raman spectra of liquid nitromethane under shock compression was monitored by means of the gas-gun loading platform and transient Raman spectroscopic technique, in order to interrogate the structure stability of the sample molecules under the effect of shock waves. It is shown in this work that Raman peaks of the sample are obviously blue shifted and broadened at the shock pressure of 10.6GPa, but no sign of the occurrence of chemical reactions in the observed wavelength range. The results do not support the previously-reported conclusions that some chemical reactions may happen in liquid nitromethane when singly shocked up to 6GPa~8.5GPa, it also confirm that the molecular structural stability of liquid nitromethane was not destroyed under this strong shock loading could not destroy within 516ns.