Evidence for dissociation in shock-compressed methane

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.

doi:10.1103/physrevb.109.064102

Title: Evidence for dissociation in shock-compressed methane

Journal Article · Fri Feb 09 00:00:00 EST 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.064102· OSTI ID:2305525

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Laboratory for Laser Energetics, Rochester, NY (United States); University of Rochester, NY (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Laboratory for Laser Energetics, Rochester, NY (United States)
University of Rochester, NY (United States)
Osaka University (Japan)
Osaka University (Japan); RIKEN SPring-8 Center, Hyogo (Japan)
University of California, Berkeley, CA (United States)
Swinburne University of Technology, Victoria (Australia)

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.

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Research Organization:: Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

Grant/Contract Number:: NA0003856; SC0020340; AC52-07NA27344; PHY2020249

OSTI ID:: 2305525

Journal Information:: Physical Review. B, Vol. 109, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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