| Autor: |
Helfrich, J., Vorberger, J., Frydrych, S., Schaumann, G., Gericke, D. O., Ravasio, A., Gauthier, M., Fletcher, L. B., Nagler, B., Barbrel, B., Bachmann, B., Gamboa, E. J., Göde, S., Granados, E., Lee, H. J., Neumayer, P., Schumaker, W., Döppner, T., Falcone, R. W., Glenzer, S. H., Roth, M., Kraus, D. |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
High Energy Density Physics 32(2019), 56-62 |
| Popis: |
We present experiments investigating dense carbon at pressures between 100 GPa and 200 GPa and temperatures between 5 000K and 15 000 K. High-pressure samples with different temperatures were created by laser-driven shock compression of graphite and varying the initial density from 1.53 g/cm3 to 2.21 g/cm3 and the drive laser intensity from 7.1TW/cm2 to 14.2TW/cm2. In order to deduce temperatures, spectrally resolved X-ray scattering was applied to determine ion-ion structure factors at a scattering vector of k = 4.12 · 1010 m−1, which shows high sensitivity to temperature for the investigated sample conditions. After comparison to corresponding DFT-MD simulations, we were able to assign each structure factor a temperature and use these results to test several theoretical predictions for the melting line of carbon at high pressures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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