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

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Warm dense matter Plasmon Thomson scattering Atomic physics Electron Scattering Plasma Physics Photon Materials science Electron density Laser Electron temperature Optics Nuclear physics

P. Sperling , E. J. Gamboa , H. J. Lee , Hyun Kyung Chung , Eric Galtier , Y. A. Omarbakiyeva , H. Reinholz , G. Röpke , U. Zastrau , J. B. Hastings , L. B. Fletcher , S. H. Glenzer ·

YOU? · · 2015 · Open Access · · DOI: https://doi.org/10.1103/physrevlett.115.115001 · OA: W2263764828

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 n_{e}=1.8×10^{23} cm^{-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.