The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa)
The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa)
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DOI：
10.1063/1.4920943
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发表时间：
2015-05
影响因子：
2.2
通讯作者：
D. Kraus;J. Vorberger;J. Helfrich;D. Gericke;B. Bachmann;V. Bagnoud;B. Barbrel;A. Blažević;D. Carroll;W. Cayzac;T. Döppner;L. Fletcher;A. Frank;S. Frydrych;E. Gamboa;M. Gauthier;S. Göde;Eduardo Granados;G. Gregori;N. Hartley;B. Kettle;H. Lee;B. Nagler;P. Neumayer;M. Notley;A. Ortner;A. Otten;A. Ravasio;D. Riley;F. Roth;G. Schaumann;D. Schumacher;W. Schumaker;K. Siegenthaler;C. Spindloe;F. Wagner;K. Wünsch;S. Glenzer;M. Roth;R. Falcone
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文献类型：
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作者：
D. Kraus;J. Vorberger;J. Helfrich;D. Gericke;B. Bachmann;V. Bagnoud;B. Barbrel;A. Blažević;D. Carroll;W. Cayzac;T. Döppner;L. Fletcher;A. Frank;S. Frydrych;E. Gamboa;M. Gauthier;S. Göde;Eduardo Granados;G. Gregori;N. Hartley;B. Kettle;H. Lee;B. Nagler;P. Neumayer;M. Notley;A. Ortner;A. Otten;A. Ravasio;D. Riley;F. Roth;G. Schaumann;D. Schumacher;W. Schumaker;K. Siegenthaler;C. Spindloe;F. Wagner;K. Wünsch;S. Glenzer;M. Roth;R. Falcone
我们给出了在100 Gpa左右的压力下，靠近熔化线的热致密碳的复杂离子结构的测量结果。高压样品是由激光驱动的石墨冲击压缩产生的，并由光子能量为4.75keV和4.95keV的强激光产生的X射线源探测。高效率的晶体光谱仪可以对散射辐射进行光谱分辨。比较弹性和非弹性散射辐射的比率，我们找到了由从头算量子模拟预测的复杂键合液体的证据，表明在这些条件下化学键的影响。利用不同初始密度的石墨样品，我们证明了在150 Gpa的相对恒定压力下，光谱分辨x射线散射能够监测碳的固液相变。展示了在直线加速器相干光源上记录的第一个质量前所未有的冷石墨的单脉冲散射光谱，我们展示了它的突出位置。
We present measurements of the complex ion structure of warm dense carbon close to the melting line at pressures around 100 GPa. High-pressure samples were created by laser-driven shock compression of graphite and probed by intense laser-generated x-ray sources with photon energies of 4.75 keV and 4.95 keV. High-efficiency crystal spectrometers allow for spectrally resolving the scattered radiation. Comparing the ratio of elastically and inelastically scattered radiation, we find evidence for a complex bonded liquid that is predicted by ab-initio quantum simulations showing the influence of chemical bonds under these conditions. Using graphite samples of different initial densities we demonstrate the capability of spectrally resolved x-ray scattering to monitor the carbon solid-liquid transition at relatively constant pressure of 150 GPa. Showing first single-pulse scattering spectra from cold graphite of unprecedented quality recorded at the Linac Coherent Light Source, we demonstrate the outstanding pos...