Turning solid aluminium transparent by intense soft X-ray photoionization

B. Nagler, U. Zastrau, R.R. Faustlin, S.M. Vinko, T. Whitcher, A.J. Nelson, R. Sobierajski, J. Krzywinski, J. Chalupsky, E. Abreu, S. Bajt, T. Bornath, T. Burian, H. Chapman, J. Cihelka, T. Doppner, S. Duesterer, Thomas Dzelzainis, M. Fajardo, E. ForsterC. Fortmann, E. Galtier, S.H. Glenzer, S. Gode, G. Gregori, V. Hajkova, P. Heimann, L. Juha, M. Jurek, Fida Y. Khattak, A.R. Khorsand, D. Klinger, M. Kozlova, T. Laarmann, H.J. Lee, R.W. Lee, K.H. Meiwes-Broer, P. Mercere, W.J. Murphy, A. Przystawik, R. Redmer, H. Reinholz, David Riley, G. Ropke, F. Rosmej, K. Saksl, R. Schott, R. Thiele, J. Tiggesbaumker, S. Toleikis, T. Tschentscher, I. Uschmann, H.J. Vollmer, J.S. Wark

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213 Citations (Scopus)


Saturable absorption is a phenomenon readily seen in the optical and infrared wavelengths. It has never been observed in core-electron transitions owing to the short lifetime of the excited states involved and the high intensities of the soft X-rays needed. We report saturable absorption of an L-shell transition in aluminium using record intensities over 10(16)W cm(-2) at a photon energy of 92 eV. From a consideration of the relevant timescales, we infer that immediately after the X-rays have passed, the sample is in an exotic state where all of the aluminium atoms have an L-shell hole, and the valence band has approximately a 9 eV temperature, whereas the atoms are still on their crystallographic positions. Subsequently, Auger decay heats the material to the warm dense matter regime, at around 25 eV temperatures. The method is an ideal candidate to study homogeneous warm dense matter, highly relevant to planetary science, astrophysics and inertial confinement fusion.
Original languageEnglish
Pages (from-to)693-696
Number of pages4
JournalNature Physics
Issue number9
Early online date26 Jul 2009
Publication statusPublished - Sep 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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