Shock Wave Compression of Three Polynuclear Aromatic Compounds

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Abstract
Polycrystalline samples of anthracene, phenanthrene, and pyrene have been stressed with shock waves to pressures of 550 kbar. States in the stressed samples were determined by measuring shock wave velocities in the samples and in an 1100 aluminum base plate used as a standard. An abrupt increase in the compressibility was noted for each material: it occurred at 176 kbar for anthracene, 201 kbar for phenanthrene, and 234 kbar for pyrene. This increase is believed to be associated with an intermolecular coupling reaction. Recovered samples of anthracene did exhibit this coupled structure. The Hugoniot and calculated isotherm both indicate that anthracene is more compressible than was previously thought. The equation of state of 1100 aluminum was determined during this work.