The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scattering

被引：14

作者：

Kraus, D. ^{[1
]}

Vorberger, J. ^{[2
]}

Helfrich, J. ^{[3
]}

Gericke, D. O. ^{[4
]}

Bachmann, B. ^{[5
]}

Bagnoud, V. ^{[6
]}

Barbrel, B. ^{[1
]}

Blazevic, A. ^{[6
]}

Carroll, D. C. ^{[7
]}

Cayzac, W. ^{[6
]}

Doeppner, T. ^{[5
]}

Fletcher, L. B. ^{[8
]}

Frank, A. ^{[9
]}

Frydrych, S. ^{[3
]}

Gamboa, E. J. ^{[8
]}

Gauthier, M. ^{[8
]}

Goede, S. ^{[8
]}

Granados, E. ^{[8
]}

Gregori, G. ^{[10
]}

Hartley, N. J. ^{[10
]}

Kettle, B. ^{[11
]}

Lee, H. J. ^{[8
]}

Nagler, B. ^{[8
]}

Neumayer, P. ^{[6
]}

Notley, M. M. ^{[7
]}

Ortner, A. ^{[3
]}

Otten, A. ^{[3
]}

Ravasio, A. ^{[8
]}

Riley, D. ^{[11
]}

Roth, F. ^{[3
]}

Schaumann, G. ^{[3
]}

Schumacher, D. ^{[3
]}

Schumaker, W. ^{[8
]}

Siegenthaler, K. ^{[3
]}

Spindloe, C. ^{[7
]}

Wagner, F. ^{[3
]}

Wuensch, K. ^{[4
]}

Glenzer, S. H. ^{[8
]}

Roth, M. ^{[3
]}

Falcone, R. W. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[4] Univ Warwick, Dept Phys, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[7] STFC Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England

[8] SLAC Natl Accelerator Lab, Menlo Pk, CA 94309 USA

[9] Helmholtz Inst Jena, D-07743 Jena, Germany

[10] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

[11] Queens Univ Belfast, Ctr Plasma Phys, Belfast BT7 1NN, Antrim, North Ireland

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

THOMSON SCATTERING; PHASE-TRANSITION; DYNAMICS; INTERIOR; NEPTUNE; URANUS; GPA;

D O I：

10.1063/1.4920943

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 possibilities for future high-precision measurements at 4th Generation Light Sources. (c) 2015 AIP Publishing LLC.

引用

页数：7

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