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

D. Kraus, J. Vorberger, J. Helfrich, D. O. Gericke, B. Bachmann, V. Bagnoud, B. Barbrel, A. Blazêvić, D. C. Carroll, W. Cayzac, T. Döppner, L. B. Fletcher, A. Frank, S. Frydrych, E. J. Gamboa, M. Gauthier, S. Göde, E. Granados, G. Gregori, N. J. HartleyB. Kettle, H. J. Lee, B. Nagler, P. Neumayer, M. 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. H. Glenzer, M. Roth, R. W. Falcone

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Abstract

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.

Original languageEnglish
Article number056307
Number of pages7
JournalPhysics of Plasmas
Volume22
Issue number5
DOIs
Publication statusPublished - 2015

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Kraus, D., Vorberger, J., Helfrich, J., Gericke, D. O., Bachmann, B., Bagnoud, V., Barbrel, B., Blazêvić, A., Carroll, D. C., Cayzac, W., Döppner, T., Fletcher, L. B., Frank, A., Frydrych, S., Gamboa, E. J., Gauthier, M., Göde, S., Granados, E., Gregori, G., ... Falcone, R. W. (2015). The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scattering. Physics of Plasmas, 22(5), [056307]. https://doi.org/10.1063/1.4920943