1. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
2. Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
3. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital/Harvard Medical School, 149 Thirteenth Street, Charlestown, Massachusetts 02129, United States