Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7397
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Funding
- EPSRC [EP/G007187/1]
- Royal Society University Research Fellowship
- Institute for Basic Science [IBS-R012-D1-2014-a00]
- Czech Science Foundation [14-29772S]
- Czech Ministry of Education [LH14072, LG13029]
- Joint High Energy Density Laboratory Plasmas Program - Office of Science, Fusion Energy Sciences and the National Nuclear Security Administration, Defense Programs [DENA0001859]
- LCLS
- Stanford University through the Stanford Institute for Materials Energy Sciences (SIMES)
- Lawrence Berkeley National Laboratory (LBNL)
- University of Hamburg through the BMBF priority programme [FSP 301]
- Center for Free-Electron Laser Science (CFEL)
- EPSRC [EP/G007187/1, EP/H035877/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G007187/1, EP/H035877/1] Funding Source: researchfish
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The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures similar to 30 eV to be several times higher than that predicted by standard semiempirical models.
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