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Autori principali: White, Thomas G., Poole, Hannah, McBride, Emma E., Oliver, Matthew, Descamps, Adrien, Fletcher, Luke B., Angermeier, W. Alex, Allen, Cameron H., Appel, Karen, Condamine, Florian P., Curry, Chandra B., Dallari, Francesco, Funk, Stefan, Galtier, Eric, Gamboa, Eliseo J., Gauthier, Maxence, Graham, Peter, Goede, Sebastian, Haden, Daniel, Kim, Jongjin B., Lee, Hae Ja, Ofori-Okai, Benjamin K., Richardson, Scott, Rigby, Alex, Schoenwaelder, Christopher, Sun, Peihao, Witte, Bastian L., Tschentscher, Thomas, Zastrau, Ulf, Nagler, Bob, Hastings, J. B., Monaco, Giulio, Gericke, Dirk O., Glenzer, Siegfried H., Gregori, Gianluca
Natura: Preprint
Pubblicazione: 2023
Soggetti:
Plasma Physics
Earth and Planetary Astrophysics
Accesso online:https://arxiv.org/abs/2311.07774
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Sommario:
  • 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$\pm$0.1 eV and 0.8$\pm$0.1 g/cm$^3$, corresponding to a pressure of $\sim$13 GPa. Inelastic x-ray scattering was used to observe the collective oscillations of the ions. With a highly improved energy resolution of $\sim$50 meV, we could clearly distinguish the Brillouin peaks from the quasielastic Rayleigh feature. Data at different wave numbers were utilized to derive a sound speed of 5.9$\pm$0.5 km/s, marking a high-temperature data point for methane and demonstrating consistency with Birch's law in this parameter regime.

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