苯冲击压缩光谱实验研究

Experimental study on shock compressive spectroscopy of benzene

给出了基于ICCD探测器的多波长强度定标方法.利用带模拟电开关的LD激光器精确测量信号传输延时,实现光谱系统同步触发.在25 GPa、35 GPa两个压力点成功测量了苯的冲击压缩光谱,摄谱时间严格限定在样品的一次冲击压缩状态.结果表明,谱线主要为苯的高温分解产物分子带状谱,随冲击压力升高,短波长一侧谱线强度变大,而最大单色辐射率基本不变.在实测波长范围内,C2的Swan(A3∏g-X3∏u)带系辐射较强,且随冲击压力升高而变强.

A Multi-wavelength intensity calibration procedure based on ICCD detector has been presented. With a laser diode which incorporates a simulated electric switch, we have measured signal propagation delay accurately. With these measurements synchronous trigger of spectrograph has been realized. We have successfully detected shock compression spectra of benzene on two pressure points of 25 GPa and 35 GPa. The spectra integral time is carefully chosen to be in simple compression state of the sample; It shows that the spectra are mainly band spectra emitted by pyrolysis production of benzene. With higher shock pressure, spectra intensity of short wavelength increases, but the maximum monochromatic radiance remains unchanged. C2 Swan （A^3Пg-X^3Пu ） bands are the most prominent ones in experimental wavelength region. Its intensity increases with higher shock compression.