Gas-phase chemical analysis in an open system using a 2-stage light gas gun

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We construct an experimental technique of gas-phase chemical analysis in an open system for 2-stage light gas guns to investigate a key parameter, which controls the amount of impact-generated vapor. The amount of impact-generated CO2 from natural calcite blocks was measured under a wide range of peak shock pressure using the proposed method. The obtained CO2 amount as a function of shock pressure is in a good agreement with a theoretical prediction by the entropy method. This result provides the first experimental evidence of the validity of the widely-used entropy method to estimate the amount of impact-generated vapor.