Hugoniot data for carbon at megabar pressures.
We present an experimental point for the carbon equation of state (EOS) at megabar pressures, obtained by laser-driven shock waves. The rear side emissivity of "two-materials two-steps" targets (Al-C) was recorded with space and time resolution and, by applying the impedance mismatch method, allowed a direct determination of relative EOS points. Experiments were performed at the PALS and LULI laboratories using carbon samples with two different values of initial density, in order to explore a wider region of the phase diagram. Previously unreached pressures were obtained. The results are compared with previous experiments and with available theoretical models and seem to show a high compressibility of carbon at megabar pressures.
Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca and INFM, Piazza della Scienza 3, 20126 Milan, Italy.
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Batani
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Strati
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Stabile
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Tomasini
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Lucchini
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Ravasio
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Koenig
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Benuzzi-Mounaix
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Nishimura
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Ochi
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Ullschmied
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Skala
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