Multi-Shock Hugoniot Equation of State of Liquid Carbon Monoxide Measured By an Optical Analysis Technique

The cryogenic target technique and an optical analysis technique are combined to measure multi-shock Hugoniot equations of state of liquid carbon monoxide. The first, second, and third shock pressures are respectively 19 GPa, 60 GPa, and 71 GPa. The maximum compression ratio of volume reaches three point five and twenty percent higher than that of ever reported one. The measured results for specific volume are nearly twenty percent less than the predicted ones by molecular fluid theory, which is attributed to the molecular dissociation reactions of carbon monoxide under shock compressions. The detail of the measurement technique and calculation method are described, and such a scheme can be applied to other molecular fluids to achieve higher pressures and larger compression ratios.