Opacity effects in a solid-density aluminium plasma created by photo-excitation with an X-ray laser

D. S. Rackstraw, S. M. Vinko, O. Ciricosta, B. I. Cho, K. Engelhorn, H. K. Chung, C. R.D. Brown, T. Burian, J. Chalupský, R. W. Falcone, C. Graves, V. Hájková, A. Higginbotham, L. Juha, J. Krzywinski, H. J. Lee, M. Messerschmidt, C. Murphy, Y. Ping, A. ScherzW. Schlotter, S. Toleikis, J. J. Turner, L. Vysin, T. Wang, B. Wu, U. Zastrau, D. Zhu, B. Nagler, R. W. Lee, P. A. Heimann, J. S. Wark

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The intensities within the focal spots of the output of recently developed X-ray sources based on free-electron-laser (FEL) technology are so great that atoms within the focal region can potentially absorb several photons during the few tens of femtosecond X-ray pulse. Furthermore, the duration of the FEL X-ray pulse is comparable to the Auger decay times of inner-shell holes created by the X-rays themselves. We report here how such a scenario can lead to opacity broadening of the fluorescence radiation emitted by the hot, dense plasma, which is created as a result of the X-radiation focussed onto a solid target, and in particular present calculations of the broadening of the Kα emission in a solid-density aluminium target, produced when the FEL photon energy is tuned below the Al K-edge, but is resonant with the Kα transition.

Original languageEnglish (US)
Pages (from-to)59-69
Number of pages11
JournalHigh Energy Density Physics
Issue number1
StatePublished - Jun 2014
Externally publishedYes


  • Opacity
  • X-ray laser

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics


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