1. Paul Scherrer Institut, Forschungsstrasse 111, CH-5232 Villigen PSI, Switzerland
2. Institute of Chemical Sciences and Engineering, École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
3. ESRF−The European Synchrotron, Rue des Martyrs 71, F-38043 Grenoble, France