1. Univ Rennes, ENSCR, INSA Rennes, CNRS, ISCR−UMR 6226, F-35000 Rennes, France
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Univ Rennes, INSA Rennes, CNRS, FOTON−UMR 6082, F-35000 Rennes, France
4. Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
5. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States