[1] Deutsch Elektronen Synchrotron DESY, Ctr Free Electron Laser Sci CFEL, Notkestr 85, D-22607 Hamburg, Germany
[2] Univ Hamburg, Hamburg Ctr Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
[3] Univ Hamburg, Inst Experimentalphys, Luruper Chaussee 149, D-22761 Hamburg, Germany
[4] Inst Madrileno Estudios Avanzados Nanociencia, Cantoblanco, Madrid 28049, Spain
[5] Univ Autonoma Madrid, Dept Quim, Madrid 28049, Spain