Resonance−enhanced multiple ionization of krypton at an x−ray free−electron laser

Benedikt Rudek,1,2,3,* Daniel Rolles,1,3,4,* Sang-Kil Son,5 Lutz Foucar,1,4 Benjamin Erk,1,2 Sascha Epp,1,2 Rebecca Boll,1,2 Denis Anielski,1,2 Christoph Bostedt,6 Sebastian Schorb,6,7 Ryan Coffee,6 John Bozek,6 Sebastian Trippel,5 Tatiana Marchenko,8 Marc Simon,8 Lauge Christensen,9 Sankar De,10,11 Shin-ichi Wada,12 Kiyoshi Ueda,13 Ilme Schlichting,1,4 Robin Santra,5,14 Joachim Ullrich,1,2,15 and Artem Rudenko1,2,16 1Max-Planck-Advanced Study Group at CFEL, DESY, Notkestrase 85, 22607 Hamburg, Germany 2Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany 3DESY, Notkestrase 85, 22607 Hamburg, Germany 4Max-Planck-Institut fur medizinische Forschung, Jahnstrase 29, 69120 Heidelberg, Germany 5Center for Free-Electron Laser Science CFEL, DESY, Notkestrase 85, 22607 Hamburg, Germany 6SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA 7Institut fur Optik und Atomare Physik, Technische Universitat Berlin, Hardenbergstrase 36, 10623 Berlin, Germany 8Laboratoire de Chimie Physique-Matiere et Rayonnement, UPMC and CNRS, 11 rue Pierre et Marie Curie, 75231 Paris, France 9Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark 10Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark 11Saha Institute of Nuclear Physics, 700064 Kolkata, India 12Department of Physical Science, Hiroshima University, 739-8236 Higashi-Hiroshima, Japan 13IMRAM, Tohoku University, Katahira 2-1-1, Aoba-ku, 980-8577 Sendai, Japan 14Department of Physics, Universitat Hamburg, Jungiusstrase 9, 20355 Hamburg, Germany 15Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany 16J. R. Macdonald Laboratory, Kansas State University, 116 Cardwell Hall, Manhattan, Kansas 66506, USA (Received 18 January 2013; published 19 February 2013)