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Measurement of diamond nucleation rates from hydrocarbons at conditions comparable to the interiors of icy giant planets

Journal Article · · Physical Review. B
We present measurements of the nucleation rate into a diamond lattice in dynamically compressed polystyrene obtained in a pump-probe experiment using a high-energy laser system and in situ femtosecond x-ray diffraction. Different temperature-pressure conditions that occur in planetary interiors were probed. For a single shock reaching 70 GPa and 3000 K no diamond formation was observed, while with a double shock driving polystyrene to pressures around 150 GPa and temperatures around 5000 K nucleation rates between 1029 and 1034 m–3 s–1 were recorded. These nucleation rates do not agree with predictions of the state-of-the-art theoretical models for carbon-hydrogen mixtures by many orders of magnitude. Our data suggest that there is significant diamond formation to be expected inside icy giant planets like Neptune and Uranus.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
Sponsoring Organization:
German Bundesministerium für Bildung, Wissenschaft, Forschung und Tech- nologie (BMBF)); Helmholtz Association; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); University of California, Center for High Energy Density Science
Grant/Contract Number:
AC02-76SF00515; AC52-07NA27344; SC0018298
OSTI ID:
1597545
Alternate ID(s):
OSTI ID: 1604902
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 101; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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