Abstract
Nanosecond time‐resolved Raman spectroscopy was performed on benzene derivatives under laser‐driven shock compression up to a few GPa using a pump‐probe technique, in order to investigate the effect of steric and chemical structures on molecular dynamics of shock compression. Under shock compression at 1.3 GPa, the ring‐breathing mode of benzene showed a high frequency shift of 10 cm−1 which corresponded to a ring reduction of 0.7 %. Under shock compression at approximately 1 GPa, the ring‐breathing and the ring‐vibrational modes showed a high frequency shift; 6 cm−1 and 0 cm−1 for benzene, 2 cm−1 and 6 cm−1 for toluene, and 4 cm−1 and 4 cm−1 for nitrobenzene, respectively. The magnitude of the frequency shift showed a systematical dependency on intermolecular distance; the ring‐breathing mode decreased in the order of benzene, nitrobenzene, toluene, while that of the ring‐vibrational increased.
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