1. Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118,
2. Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, 46, Allée d’Italie, 69364 Lyon Cedex 07, France
3. MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden