Speed of sound in methane under conditions of planetary interiors-Reference-Cited by-同舟云学术

Speed of sound in methane under conditions of planetary interiors

Published:2024-05-02 Issue:2 Volume:6 Page:
ISSN:2643-1564
Container-title:Physical Review Research
language:en
Short-container-title:Phys. Rev. Research

Author:

White Thomas G.¹²^ORCID,Poole Hannah²^ORCID,McBride Emma E.³⁴^ORCID,Oliver Matthew¹²⁵,Descamps Adrien³⁴^ORCID,Fletcher Luke B.³,Angermeier W. Alex¹,Allen Cameron H.¹^ORCID,Appel Karen⁶,Condamine Florian P.⁷,Curry Chandra B.³⁸,Dallari Francesco⁹,Funk Stefan¹⁰^ORCID,Galtier Eric³,Gamboa Eliseo J.³,Gauthier Maxence³,Graham Peter¹¹,Goede Sebastian⁶,Haden Daniel¹,Kim Jongjin B.³,Lee Hae Ja³,Ofori-Okai Benjamin K.³,Richardson Scott¹¹,Rigby Alex²,Schoenwaelder Christopher³,Sun Peihao⁹,Witte Bastian L.³,Tschentscher Thomas⁶^ORCID,Zastrau Ulf⁶^ORCID,Nagler Bob³,Hastings J. B.³,Monaco Giulio⁹,Gericke Dirk O.¹²^ORCID,Glenzer Siegfried H.³,Gregori Gianluca²^ORCID

Affiliation:

1. Department of Physics, University of Nevada, Reno, Nevada 89557, USA

2. Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom

3. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA

4. School of Mathematics and Physics, Queens University Belfast, University Road, Belfast BT7 1NN, United Kingdom

5. Central Laser Facility, STFC Rutherford-Appleton Laboratory, Chilton OX11 0QX, United Kingdom

6. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany

7. Extreme Light Infrastructure ERIC, ELI Beamlines Facility, Za Radnici 835, CZ-252 41 Dolni Brezany, Czech Republic

8. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9

9. Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università degli Studi di Padova, Via F. Marzolo, 8, I-35131 Padova, Italy

10. Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Nikolaus-Fiebiger-Str. 2, 91058 Erlangen, Germany

11. AWE, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom

12. Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

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.

Published by the American Physical Society

2024

Funder

U.S. Department of Energy

Office of Science

Fusion Energy Sciences

National Nuclear Security Administration

Deutsche Forschungsgemeinschaft

Natural Sciences and Engineering Research Council of Canada

Basic Energy Sciences

Science and Technologies Facilities Council

U.K. Research & Innovation Future Leaders Fellowship