[1] Deutsch Elektronen Synchrotron DESY, Ctr Free Electron Laser Sci CFEL, D-22607 Hamburg, Germany
[2] Univ Hamburg, Dept Phys, D-22761 Hamburg, Germany
[3] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany
[4] Univ Hamburg, Hamburg Ctr Ultrafast Imaging, D-22761 Hamburg, Germany
[5] Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark
[6] MPG, Fritz Haber Inst, D-14195 Berlin, Germany
[7] CFEL, Max Planck Adv Study Grp, D-22607 Hamburg, Germany
[8] FOM Inst AMOLF, NL-1098 XG Amsterdam, Netherlands
[9] Max Born Inst, D-12489 Berlin, Germany
[10] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany
[11] Kansas State Univ, Dept Phys, JR Macdonald Lab, Manhattan, KS 66506 USA
[12] Lund Univ, Dept Phys, S-22100 Lund, Sweden
[13] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA
[14] Max Planck Inst Med Res, D-69120 Heidelberg, Germany
[15] PNSensor GmbH, D-81739 Munich, Germany
[16] Max Planck Semicond Lab, D-81739 Munich, Germany
[17] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
[18] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
[19] Aarhus Univ, Interdisciplinary Nanosci Ctr INANO, DK-8000 Aarhus C, Denmark