1. Departments of Chemistry and Materials Science & Engineering, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16801
2. Department of Chemistry, Cornell University, Baker Laboratory, Ithaca, New York 14853
3. Cornell High Energy Synchrotron Source, 200 L Wilson Lab, Ithaca, New York 14853
4. Department of Physics, The Pennsylvania State University, 104 Davey, University Park, Pennsylvania 16801
5. Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heildelberg, Germany