Nanosecond time-resolved Raman spectroscopy has been performed on cyclic hydrocarbons, benzene, and cyclohexane under laser-driven shock compression at about 1.3 GPa. The spectral peak attributed to the ring-breathing mode of both benzene and cyclohexane showed a blue shift of about $10\hspace{0.5em}{\mathrm{cm}}^{-1}.$ Intensity increase of the shifted peak due to the propagation of the shock wave was observed. The decreasing rate of the intensity ratio suggests a decrease in the Raman cross section of compressed matters.

• Received 18 October 2001

DOI:https://doi.org/10.1103/PhysRevB.65.174116