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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