レーザー衝撃圧縮下におけるベンゼンのナノ秒高速凝固反応: 時間分解コヒーレントアンチストークスラマン分光測定

抄録

Phase transition of benzene has been studied under laser-shock compression up to 4.2 GPa by using nanosecond time-resolved coherent anti-Stokes Raman spectroscopy. The shock wave is generated by irradiation of 10-ns pulsed laser beam on the plasma confinement target and its pressure is estimated from a particle velocity, which is measured by a velocity interferometer. The temporal evolution of the wavenumber shift of the ring-breathing mode and the C-H stretching mode is investigated. A metastable supercompressed state and a liquid-solid phase transition are observed under shock compression. Time-resolved Raman spectra reveal that the liquid state is ini-tially preserved and rapidly transforms to the solid state within 25 ns under shock compression at 4.2 GPa.