Evidence for dissociation in shock-compressed methane

Theory and experiments show that with increasing pressure, the chemical bonds of methane rearrange, leading to the formation of complex polymers and then to dissociation. However, there is disagreement on the exact conditions where these changes take place. In this study, methane samples were precom...

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Bibliographic Details
Published in:Physical review. B 2024-02, Vol.109 (6), Article 064102
Main Authors: Tabak, G., Rygg, J. R., Millot, M., Kim, Y.-J., Hamel, S., Celliers, P. M., Fratanduono, D. E., Ali, S., Erskine, D., Boehly, T. R., Suer, T.-A., Dasenbrock-Gammon, N., Dias, R., Zhang, S., Hu, S. X., Hansen, L. E., Henderson, B. J., Zaghoo, M., Ogawa, T., Murayama, D., Miyanishi, K., Ozaki, N., Sano, T., Jeanloz, R., Hicks, D. G., Eggert, J. H., Collins, G. W.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Equations of state
High-pressure studies
Shock waves
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Summary:Theory and experiments show that with increasing pressure, the chemical bonds of methane rearrange, leading to the formation of complex polymers and then to dissociation. However, there is disagreement on the exact conditions where these changes take place. In this study, methane samples were precompressed in diamond-anvil cells and then shock compressed to pressures reaching 400 GPa, the highest pressures yet explored in methane. Furthermore, the results reveal a qualitative change in the Hugoniot curve at 80-150 GPa, which is interpreted as a signature of dissociation based on thermodynamic calculations and theoretical predictions.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.109.064102