Nanosecond rapid freezing of liquid benzene under shock compression studied by time-resoived coherent anti-Stokes Raman spectroscopy

摘要

Nanosecond time-resolved coherent anti-Stokes Raman spectroscopy is used to investigate the shock-induced liquid-solid phase transition and crystallization of liquid benzene.Temporal evolution of the Raman shift of the ring-breathing and C-H stretching modes 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 initially a metastable state and rapidly transforms to the solid state within 25 ns under shock compression at 4.2 GPa.