@article{7106, author = {B. Nagler and U. Zastrau and R. R. Faustlin and S. M. Vinko and T. Whitcher and A. J. Nelson and R. Sobierajski and J. Krzywinski and J. Chalupsky and E. Abreu and S. Bajt and T. Bornath and T. Burian and H. Chapman and J. Cihelka and T. Doppner and S. Duesterer and T. Dzelzainis and M. Fajardo and E. Forster and C. Fortmann and E. Galtier and S. H. Glenzer and S. Gode and G. Gregori and V. Hajkova and P. Heimann and L. Juha and M. Jurek and F . Y. Khattak and A. R. Khorsand and D. Klinger and M. Kozlova and T. Laarmann and H. J. Lee and R. W. Lee and K. H. Meiwes-Broer and P. Mercere and W. J. Murphy and A. Przystawik and R. Redmer and H. Reinholz and D. Riley and G. Ropke and F. Rosmej and K. Saksl and R. Schott and R. Thiele and J. Tiggesbaumker and S. Toleikis and T. Tschentscher and I. Uschmann and H. J. Vollmer and J. S. Wark}, title = {Turning solid aluminium transparent by intense soft X-ray photoionization}, abstract = {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.}, year = {2009}, journal = {Nature Physics}, volume = {5}, number = {9}, pages = {693-696}, month = {Sep}, isbn = {1745-2473}, url = {://000270095600024 }, note = {ISI Document Delivery No.: 497WRTimes Cited: 0Cited Reference Count: 28}, language = {English}, }