1. Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
2. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
3. Institute of Physics, Kazan Federal University, Kazan 420008, Russian Federation
4. Department of Physics, Graduate Center and City College of New York, City University of New York, New York, New York 10016, United States