Ma, T., Döppner, T., Falcone, R. W., Fletcher, L., Fortmann, C., Gericke, Dirk O., Landen, O. L., Lee, H. J., Pak, A., Vorberger, Jan, Wünsch, Kathrin and Glenzer, S. H. (2013) X-Ray scattering measurements of strong ion-ion correlations in shock-compressed aluminum. Physical Review Letters, Volume 110 (Number 6). Article number 065001 . doi:10.1103/PhysRevLett.110.065001 ISSN 0031-9007.

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Abstract

The strong ion-ion correlation peak characteristic of warm dense matter (WDM) is observed for the first time using simultaneous angularly, temporally, and spectrally resolved x-ray scattering measurements in laser-driven shock-compressed aluminum. Laser-produced molybdenum x-ray line emission at an energy of 17.9 keV is employed to probe aluminum compressed to a density of ρ>8  g/cm3. We observe a well pronounced peak in the static structure factor at a wave number of k=4.0  Å-1. The measurements of the magnitude and position of this correlation peak are precise enough to test different theoretical models for the ion structure and show that only models taking the complex interaction in WDM into account agree with the data. This also demonstrates a new highly accurate diagnostic to directly measure the state of compression of warm dense matter.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	February 2013
Dates:	Date Event February 2013 Published
Volume:	Volume 110
Number:	Number 6
Page Range:	Article number 065001
DOI:	10.1103/PhysRevLett.110.065001
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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