Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter

P. Sperling, E.J. Gamboa, H.J. Lee, H.K. Chung, E. Galtier, Y. Omarbakiyeva, Heidi Reinholz, G. Röpke, U. Zastrau, J. Hastings, L.B. Fletcher, S.H. Glenzer

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    Abstract

    © 2015 American Physical Society. We present the first highly resolved measurements of the plasmon spectrum in an ultrafast heated solid. Multi-keV x-ray photons from the Linac Coherent Light Source have been focused to one micrometer diameter focal spots producing solid density aluminum plasmas with a known electron density of ne=1.8×1023cm-3. Detailed balance is observed through the intensity ratio of up- and down-shifted plasmons in x-ray forward scattering spectra measuring the electron temperature. The plasmon damping is treated by electron-ion collision models beyond the Born approximation to determine the electrical conductivity of warm dense aluminum.
    Original languageEnglish
    Pages (from-to)Article 115001
    JournalPhysical Review Letters
    Volume115
    Issue number11
    DOIs
    Publication statusPublished - 2015

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