Direct measurements of the ionization potential depression in a dense plasma

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

Research output: Contribution to journalArticlepeer-review

226 Scopus citations


We have used the Linac Coherent Light Source to generate solid-density aluminum plasmas at temperatures of up to 180 eV. By varying the photon energy of the x rays that both create and probe the plasma, and observing the K-α fluorescence, we can directly measure the position of the K edge of the highly charged ions within the system. The results are found to disagree with the predictions of the extensively used Stewart-Pyatt model, but are consistent with the earlier model of Ecker and Kröll, which predicts significantly greater depression of the ionization potential.

Original languageEnglish (US)
Article number065002
JournalPhysical Review Letters
Issue number6
StatePublished - Aug 6 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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