Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter
Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter
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DOI：
10.1103/physrevlett.115.115001
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发表时间：
2015-09-09
影响因子：
8.6
通讯作者：
Glenzer, S. H.
中科院分区：
文献类型：
--
作者：
Sperling, P.;Gamboa, E. J.;Glenzer, S. H.
我们提出了第一个高分辨率的测量等离子体光谱在超快加热固体。来自直线加速器相干光源的多keV X射线光子已被聚焦到直径为1微米的焦斑，产生具有已知电子密度n（e）= 1.8 x 10（23）cm（-3）的固体密度铝等离子体。通过测量电子温度的X射线前向散射光谱中的上移和下移等离子体激元的强度比观察到详细的平衡。用玻恩近似以外的电子-离子碰撞模型处理等离激元阻尼，确定了热致密铝的电导率。
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 x 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.