1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.
2. Department of Physics, Emory University, Atlanta, GA, USA.
3. Elettra Sincrotrone Trieste, Basovizza, Italy.
4. Department of Molecular Sciences and Nanosystems, Ca’Foscari University of Venice, Venice, Italy.
5. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany.
6. Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy.
7. CNR-Istituto Officina dei Materiali, Trieste, Italy.
8. Helmholtz-Zentrum Berlin Für Materialien und Energie GmbH, Hahn-Metiner-Platz 1, 14109 Berlin, Germany.
9. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2A, 12489 Berlin, Germany.
10. Department Physik, Universität Siegen, Siegen, Germany.
11. Department of Physics, Università degli Studi di Trieste, 34127 Trieste, Italy.
12. Department of Physics, Stockholm University, Stockholm, Sweden.
13. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.