1. CEA INAC SPrAM UMR5819 (CEA-CNRS-UJF); 17 rue des martyrs F-38054 Grenoble Cedex 9 France
2. Department of Computational Physics; IFM, Linköping University; SE-58183 Linköping Sweden
3. Laboratory for Chemistry of Novel Materials; Center of Innovation and Research in MAterials & Polymers (CIRMAP); Research Insitute for Materials Science and Engineering; University of Mons; 20 Place du Parc B-7000 Mons Belgium