Speed of sound in methane under conditions of planetary interiors
White TG, Poole H, McBride EE, Oliver M, Descamps A, Fletcher LB, Angermeier WA, Allen CH, Appel K, Condamine FP, Curry CB, Dallari F, Funk S, Galtier E, Gamboa EJ, Gauthier M, Graham P, Goede S, Haden D, Kim JB, Lee HJ, Ofori-Okai BK, Richardson S, Rigby A, Schoenwaelder C, Sun P, Witte BL, Tschentscher T, Zastrau U, Nagler B, Hastings JB, Monaco G, Gericke DO, Glenzer SH, Gregori G (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 6
Article Number: L022029
Journal Issue: 2
DOI: 10.1103/PhysRevResearch.6.L022029
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.
Authors with CRIS profile
Involved external institutions
Atomic Weapons Establishment (AWE)
United Kingdom (GB)
University of Nevada, Reno
United States (USA) (US)
European XFEL GmbH
Germany (DE)
University of Padua / Universita degli Studi di Padova
Italy (IT)
Stanford National Accelerator Laboratory (SLAC)
United States (USA) (US)
University of Oxford
United Kingdom (GB)
ELI Beamlines
Czech Republic (CZ)
United Kingdom (GB)
University of Nevada, Reno
United States (USA) (US)
European XFEL GmbH
Germany (DE)
University of Padua / Universita degli Studi di Padova
Italy (IT)
Stanford National Accelerator Laboratory (SLAC)
United States (USA) (US)
University of Oxford
United Kingdom (GB)
ELI Beamlines
Czech Republic (CZ)
How to cite
APA:
White, T.G., Poole, H., McBride, E.E., Oliver, M., Descamps, A., Fletcher, L.B.,... Gregori, G. (2024). Speed of sound in methane under conditions of planetary interiors. Physical Review Research, 6(2). https://doi.org/10.1103/PhysRevResearch.6.L022029
MLA:
White, Thomas G., et al. "Speed of sound in methane under conditions of planetary interiors." Physical Review Research 6.2 (2024).
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