Resolving ultrafast heating of dense cryogenic hydrogen.
Resolving ultrafast heating of dense cryogenic hydrogen.
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DOI：
10.1103/physrevlett.112.105002
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
U. Zastrau;P. Sperling;M. Harmand;A. Becker;T. Bornath;R. Bredow;S. Dziarzhytski;T. Fennel;L. Fletcher;Eckhart Förster;S. Göde;G. Gregori;V. Hilbert;D. Hochhaus;B. Holst;T. Laarmann;H. Lee;T. Ma;J. Mithen;R. Mitzner;C. Murphy;M. Nakatsutsumi;P. Neumayer;A. Przystawik;S. Roling;M. Schulz;B. Siemer;S. Skruszewicz;J. Tiggesbäumker;S. Toleikis;T. Tschentscher;T. White;M. Wöstmann;H. Zacharias;T. Döppner;S. Glenzer;R. Redmer
中科院分区：
文献类型：
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作者：
U. Zastrau;P. Sperling;M. Harmand;A. Becker;T. Bornath;R. Bredow;S. Dziarzhytski;T. Fennel;L. Fletcher;Eckhart Förster;S. Göde;G. Gregori;V. Hilbert;D. Hochhaus;B. Holst;T. Laarmann;H. Lee;T. Ma;J. Mithen;R. Mitzner;C. Murphy;M. Nakatsutsumi;P. Neumayer;A. Przystawik;S. Roling;M. Schulz;B. Siemer;S. Skruszewicz;J. Tiggesbäumker;S. Toleikis;T. Tschentscher;T. White;M. Wöstmann;H. Zacharias;T. Döppner;S. Glenzer;R. Redmer
本文报道了由≲300fs，92 eV自由电子激光x射线暴引发的低温氢的超快加热动力学。来自第二个x射线脉冲的x射线散射幅度的上升探测了从致密的低温分子氢到几乎不相关的等离子体结构的转变，表明电子-离子平衡时间为∼0.9ps。上升时间与基于部分电离等离子体电导率模型的辐射流体动力学模拟一致，该模型得到了双温密度泛函理论的验证。
We report on the dynamics of ultrafast heating in cryogenic hydrogen initiated by a ≲300 fs, 92 eV free electron laser x-ray burst. The rise of the x-ray scattering amplitude from a second x-ray pulse probes the transition from dense cryogenic molecular hydrogen to a nearly uncorrelated plasmalike structure, indicating an electron-ion equilibration time of ∼0.9 ps. The rise time agrees with radiation hydrodynamics simulations based on a conductivity model for partially ionized plasma that is validated by two-temperature density-functional theory.