Response of liquid carbon disulfide to shock compression. II. Experimental design and measured Hugoniot information

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Abstract
Carbon disulfide (CS2) is known to encounter a region of high compressibility upon shock loading which is conjectured to accompany a reaction precipitated by the shock loading. One candidate explanation for this is that the CS2 reacts chemically with an accompanying negative volume change. An idealized double-shock experiment is proposed to probe the process using conventional shock measurables. Shock experiments based on this idea used a sapphire-faced projectile to impact a plastic cell containing the CS2, constructed with a sapphire back plate which served as an anvil to produce the second shock. Electromagnetic velocity gauges were used to monitor the particle velocity history at several Lagrangian positions in the liquid. The ‘‘unreacted’’ Hugoniot was deduced from measurements made as the initial shock traversed the CS2. Upon reflection of the initial shock from the sapphire anvil, an evolving two-wave structure was observed, a direct result of the increased compressibility. The Hugoniot cusp at the onset of the high compressibility region is estimated to occur at about 4.6 GPa, a value somewhat lower than previously reported. Based on an analysis of the states achieved in the two-wave structure, the reaction is inferred to be much more temperature than pressure dependent, adding strength to the hypothesis that a chemical reaction rather than a phase transition is occurring.

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