Effect of initial phase on ultraviolet/visible absorption in shocked carbon disulfide/hexane mixtures

Abstract

The effect of initial phase on shock-induced spectral changes in carbon disulfide/hexane has been examined by monitoring the edge shift of the V-band. Experiments were carried out to a peak pressure of 10 GPa for three different concentrations of carbon disulfide. Shifts of the absorption band in solid mixtures differ markedly from those in liquid mixtures at high pressures. The rate of edge shift with pressure in solid mixtures becomes independent of the carbon disulfide concentration and approaches the rate of shift in pure carbon disulfide. Similar results are not obtained for liquid mixtures. Temperature results cannot explain the observed differences. The experimental data suggest the occurrence of phase separation in the solid mixtures and two possible mechanisms for phase separation are indicated. The present results show the importance of the initial phase in understanding the spectral differences observed for these mixtures under shock and static loading.