[1] Univ Gothenburg, Dept Chem & Mol Biol, Gothenburg, Sweden
[2] DESY, Ctr Free Electron Laser Sci, Hamburg, Germany
[3] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA USA
[4] Uppsala Univ, Dept Chem, Angstrom Lab, Uppsala, Sweden
[5] Max Planck Inst Med Res, D-69120 Heidelberg 1, Germany
[6] Ctr Free Elect Laser Sci, Max Planck Adv Study Grp, Hamburg, Germany
[7] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
[8] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[9] SLAC Natl Accelerator Lab, PULSE Inst Ultrafast Energy Sci, Menlo Pk, CA USA
[10] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
[11] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[12] Lawrence Livermore Natl Lab, Livermore, CA USA
[13] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ USA
[14] Univ Chicago, BioCARS, Chicago, IL 60637 USA
[15] Univ Jyvaskyla, Nanosci Ctr, Jyvaskyla, Finland
[16] Univ Jyvaskyla, Dept Chem, Jyvaskyla, Finland
[17] Univ Hamburg, Dept Phys, Hamburg, Germany
[18] Ctr Ultrafast Imaging, Hamburg, Germany