1. Department of Physics and Astronomy, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854, USA
2. Department of Chemistry and Biochemistry, Delaware Valley College, Doylestown, Pennsylvania 18901, USA
3. Department of Chemistry and Chemical Biology and BioMaPS Institute for Quantitative Biology, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854, USA