1. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, Jules Stein Eye Institute and the Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024, Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL-30-059 Krakow, Poland, and Department of Physics, University of Albany, SUNY, Albany, New York 12222