1. Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Federale de Lausanne, Lausanne CH-1015, Switzerland
2. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France
3. Department of Chemistry, Materials and Chemical Engineering, Polytechnics of Milan, Via Mancinelli 7, 20131, Milan, Italy
4. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
5. Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland