1. Ultrafast Optical Processes Laboratory,
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
2. Department of Pharmacology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United
States
3. School of Nano-Bioscience
and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
4. Comprehensive Cancer Center, University of Michigan, Ann Arbor, Michigan 48109,
United States
5. Departments
of Biochemistry and Biophysics, and Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United
States