Journal article
Speed of sound in methane under conditions of planetary interiors
- Abstract:
- We present direct observations of acoustic waves in warm dense matter. We analyze wave-number- and energy-resolved x-ray spectra taken from warm dense methane created by laser heating a cryogenic liquid jet. X-ray diffraction and inelastic free-electron scattering yield sample conditions of 0.3±0.1 eV and 0.8±0.1 g/cm−3, corresponding to a pressure of ∼13 GPa. Inelastic x-ray scattering was used to observe the collective oscillations of the ions. With a highly improved energy resolution of ∼50 meV, we could clearly distinguish the Brillouin peaks from the quasielastic Rayleigh feature. Data at different wave numbers were utilized to derive a sound speed of 5.9±0.5 km/s, marking a high-temperature data point for methane and demonstrating consistency with Birch's law in this parameter regime.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.5MB, Terms of use)
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- Publisher copy:
- 10.1103/physrevresearch.6.l022029
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review Research More from this journal
- Volume:
- 6
- Issue:
- 2
- Article number:
- l022029
- Publication date:
- 2024-05-02
- Acceptance date:
- 2024-04-01
- DOI:
- EISSN:
-
2643-1564
- ISSN:
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2643-1564
- Language:
-
English
- Pubs id:
-
1995776
- Local pid:
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pubs:1995776
- Deposit date:
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2024-05-14
Terms of use
- Copyright date:
- 2024
- Rights statement:
- Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
- Licence:
- CC Attribution (CC BY)
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