1. Departments of Chemistry and Physics, The Pennsylvania State University, University Park, Pennsylvania 16802
2. School of Natural Sciences, University of California, Merced, 5200 N. Lake Road, Merced, California 95343
3. Department of Chemistry, Northwestern University, Evanston, Illinois 60208
4. VRI, Inc., Tokyo 150-0001, Japan
5. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802
6. California NanoSystems Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095